diff --git a/dom/ipc/ContentChild.cpp b/dom/ipc/ContentChild.cpp
index 63fb47dc0734..28a8ee8a8e47 100644
--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -25,6 +25,7 @@
 #include "mozilla/Unused.h"
 #include "mozilla/StaticPrefs.h"
 #include "mozilla/TelemetryIPC.h"
+#include "mozilla/VideoDecoderManagerChild.h"
 #include "mozilla/devtools/HeapSnapshotTempFileHelperChild.h"
 #include "mozilla/docshell/OfflineCacheUpdateChild.h"
 #include "mozilla/dom/ClientManager.h"
@@ -34,7 +35,6 @@
 #include "mozilla/dom/ContentBridgeParent.h"
 #include "mozilla/dom/ContentProcessMessageManager.h"
 #include "mozilla/dom/DOMPrefs.h"
-#include "mozilla/dom/VideoDecoderManagerChild.h"
 #include "mozilla/dom/ContentParent.h"
 #include "mozilla/dom/DataTransfer.h"
 #include "mozilla/dom/DocGroup.h"
diff --git a/dom/media/ipc/GpuDecoderModule.cpp b/dom/media/ipc/GpuDecoderModule.cpp
index c08994e92308..792a41bbf792 100644
--- a/dom/media/ipc/GpuDecoderModule.cpp
+++ b/dom/media/ipc/GpuDecoderModule.cpp
@@ -8,16 +8,14 @@
 #include "base/thread.h"
 #include "mozilla/layers/SynchronousTask.h"
 #include "mozilla/StaticPrefs.h"
-
-#include "RemoteMediaDataDecoder.h"
 #include "VideoDecoderChild.h"
 #include "VideoDecoderManagerChild.h"
 
+#include "RemoteMediaDataDecoder.h"
+
 namespace mozilla {
 
 using base::Thread;
-using dom::VideoDecoderChild;
-using dom::VideoDecoderManagerChild;
 using namespace ipc;
 using namespace layers;
 using namespace gfx;
diff --git a/dom/media/ipc/PVideoDecoder.ipdl b/dom/media/ipc/PVideoDecoder.ipdl
index e75e51ccee07..b8f6a219a292 100644
--- a/dom/media/ipc/PVideoDecoder.ipdl
+++ b/dom/media/ipc/PVideoDecoder.ipdl
@@ -11,7 +11,6 @@ include LayersSurfaces;
 using mozilla::layers::LayersBackend from "mozilla/layers/LayersTypes.h";
 
 namespace mozilla {
-namespace dom {
 
 struct VideoDataIPDL
 {
@@ -59,5 +58,4 @@ child:
   async Error(nsresult error);
 };
 
-} // namespace dom
 } // namespace mozilla
diff --git a/dom/media/ipc/PVideoDecoderManager.ipdl b/dom/media/ipc/PVideoDecoderManager.ipdl
index 60c0dbe29a26..be894c404596 100644
--- a/dom/media/ipc/PVideoDecoderManager.ipdl
+++ b/dom/media/ipc/PVideoDecoderManager.ipdl
@@ -13,7 +13,6 @@ using mozilla::CreateDecoderParams::Option from "PlatformDecoderModule.h";
 using mozilla::CreateDecoderParams::OptionSet from "PlatformDecoderModule.h";
 
 namespace mozilla {
-namespace dom {
 
 sync protocol PVideoDecoderManager
 {
@@ -36,5 +35,4 @@ parent:
   async DeallocateSurfaceDescriptorGPUVideo(SurfaceDescriptorGPUVideo sd);
 };
 
-} // namespace dom
 } // namespace mozilla
diff --git a/dom/media/ipc/VideoDecoderChild.cpp b/dom/media/ipc/VideoDecoderChild.cpp
index b31287324519..67a0ef044072 100644
--- a/dom/media/ipc/VideoDecoderChild.cpp
+++ b/dom/media/ipc/VideoDecoderChild.cpp
@@ -13,7 +13,6 @@
 #include "GPUVideoImage.h"
 
 namespace mozilla {
-namespace dom {
 
 using base::Thread;
 using namespace ipc;
@@ -127,7 +126,7 @@ void VideoDecoderChild::ActorDestroy(ActorDestroyReason aWhy) {
     // it'll be safe for MediaFormatReader to recreate decoders
     RefPtr<VideoDecoderChild> ref = this;
     GetManager()->RunWhenRecreated(
-        NS_NewRunnableFunction("dom::VideoDecoderChild::ActorDestroy", [=]() {
+        NS_NewRunnableFunction("VideoDecoderChild::ActorDestroy", [=]() {
           MediaResult error(NS_ERROR_DOM_MEDIA_NEED_NEW_DECODER);
           error.SetGPUCrashTimeStamp(ref->mGPUCrashTime);
           if (ref->mInitialized) {
@@ -326,5 +325,4 @@ VideoDecoderManagerChild* VideoDecoderChild::GetManager() {
   return static_cast<VideoDecoderManagerChild*>(Manager());
 }
 
-}  // namespace dom
 }  // namespace mozilla
diff --git a/dom/media/ipc/VideoDecoderChild.h b/dom/media/ipc/VideoDecoderChild.h
index 006cad5f9b39..034ce9de3cb7 100644
--- a/dom/media/ipc/VideoDecoderChild.h
+++ b/dom/media/ipc/VideoDecoderChild.h
@@ -3,16 +3,15 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#ifndef include_dom_ipc_VideoDecoderChild_h
-#define include_dom_ipc_VideoDecoderChild_h
+#ifndef include_ipc_VideoDecoderChild_h
+#define include_ipc_VideoDecoderChild_h
 
 #include "MediaResult.h"
 #include "PlatformDecoderModule.h"
-#include "mozilla/dom/PVideoDecoderChild.h"
+#include "mozilla/PVideoDecoderChild.h"
 #include "IRemoteDecoderChild.h"
 
 namespace mozilla {
-namespace dom {
 
 class RemoteVideoDecoder;
 class RemoteDecoderModule;
@@ -88,7 +87,6 @@ class VideoDecoderChild final : public PVideoDecoderChild,
   TimeStamp mGPUCrashTime;
 };
 
-}  // namespace dom
 }  // namespace mozilla
 
-#endif  // include_dom_ipc_VideoDecoderChild_h
+#endif  // include_ipc_VideoDecoderChild_h
diff --git a/dom/media/ipc/VideoDecoderManagerChild.cpp b/dom/media/ipc/VideoDecoderManagerChild.cpp
index e4edd206a8c8..564b8b8a4503 100644
--- a/dom/media/ipc/VideoDecoderManagerChild.cpp
+++ b/dom/media/ipc/VideoDecoderManagerChild.cpp
@@ -6,8 +6,8 @@
 
 #include "VideoDecoderManagerChild.h"
 #include "VideoDecoderChild.h"
-#include "mozilla/dom/ContentChild.h"
 #include "nsThreadUtils.h"
+#include "mozilla/dom/ContentChild.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/ipc/ProtocolUtils.h"
 #include "mozilla/layers/SynchronousTask.h"
@@ -16,7 +16,6 @@
 #include "base/task.h"
 
 namespace mozilla {
-namespace dom {
 
 using namespace ipc;
 using namespace layers;
@@ -60,7 +59,7 @@ static UniquePtr<nsTArray<RefPtr<Runnable>>> sRecreateTasks;
 
   if (sVideoDecoderChildThread) {
     sVideoDecoderChildThread->Dispatch(
-        NS_NewRunnableFunction("dom::VideoDecoderManagerChild::Shutdown",
+        NS_NewRunnableFunction("VideoDecoderManagerChild::Shutdown",
                                []() {
                                  if (sDecoderManager &&
                                      sDecoderManager->CanSend()) {
@@ -164,7 +163,7 @@ bool VideoDecoderManagerChild::DeallocShmem(mozilla::ipc::Shmem& aShmem) {
     RefPtr<VideoDecoderManagerChild> self = this;
     mozilla::ipc::Shmem shmem = aShmem;
     sVideoDecoderChildThread->Dispatch(
-        NS_NewRunnableFunction("dom::VideoDecoderManagerChild::DeallocShmem",
+        NS_NewRunnableFunction("VideoDecoderManagerChild::DeallocShmem",
                                [self, shmem]() {
                                  if (self->CanSend()) {
                                    mozilla::ipc::Shmem shmemCopy = shmem;
@@ -241,7 +240,7 @@ void VideoDecoderManagerChild::DeallocateSurfaceDescriptorGPUVideo(
   SurfaceDescriptorGPUVideo sd = std::move(aSD);
   sVideoDecoderChildThread->Dispatch(
       NS_NewRunnableFunction(
-          "dom::VideoDecoderManagerChild::DeallocateSurfaceDescriptorGPUVideo",
+          "VideoDecoderManagerChild::DeallocateSurfaceDescriptorGPUVideo",
           [ref, sd]() {
             if (ref->CanSend()) {
               ref->SendDeallocateSurfaceDescriptorGPUVideo(sd);
@@ -254,5 +253,4 @@ void VideoDecoderManagerChild::HandleFatalError(const char* aMsg) const {
   dom::ContentChild::FatalErrorIfNotUsingGPUProcess(aMsg, OtherPid());
 }
 
-}  // namespace dom
 }  // namespace mozilla
diff --git a/dom/media/ipc/VideoDecoderManagerChild.h b/dom/media/ipc/VideoDecoderManagerChild.h
index da149a541edf..d6863086f3e1 100644
--- a/dom/media/ipc/VideoDecoderManagerChild.h
+++ b/dom/media/ipc/VideoDecoderManagerChild.h
@@ -3,17 +3,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#ifndef include_dom_ipc_VideoDecoderManagerChild_h
-#define include_dom_ipc_VideoDecoderManagerChild_h
+#ifndef include_ipc_VideoDecoderManagerChild_h
+#define include_ipc_VideoDecoderManagerChild_h
 
 #include "mozilla/RefPtr.h"
-#include "mozilla/dom/PVideoDecoderManagerChild.h"
+#include "mozilla/PVideoDecoderManagerChild.h"
 
 namespace mozilla {
 namespace gfx {
 class SourceSurface;
 }
-namespace dom {
 
 class VideoDecoderManagerChild final : public PVideoDecoderManagerChild,
                                        public mozilla::ipc::IShmemAllocator {
@@ -93,7 +92,6 @@ class VideoDecoderManagerChild final : public PVideoDecoderManagerChild,
   bool mCanSend;
 };
 
-}  // namespace dom
 }  // namespace mozilla
 
-#endif  // include_dom_ipc_VideoDecoderManagerChild_h
+#endif  // include_ipc_VideoDecoderManagerChild_h
diff --git a/dom/media/ipc/VideoDecoderManagerParent.cpp b/dom/media/ipc/VideoDecoderManagerParent.cpp
index 62d4d4029c29..85fff3e588b7 100644
--- a/dom/media/ipc/VideoDecoderManagerParent.cpp
+++ b/dom/media/ipc/VideoDecoderManagerParent.cpp
@@ -30,8 +30,6 @@ extern const nsCString GetFoundD3D11BlacklistedDLL();
 extern const nsCString GetFoundD3D9BlacklistedDLL();
 #endif  // XP_WIN
 
-namespace dom {
-
 using namespace ipc;
 using namespace layers;
 using namespace gfx;
@@ -58,7 +56,7 @@ class VideoDecoderManagerThreadHolder {
  private:
   ~VideoDecoderManagerThreadHolder() {
     NS_DispatchToMainThread(
-        NS_NewRunnableFunction("dom::VideoDecoderManagerThreadHolder::~"
+        NS_NewRunnableFunction("VideoDecoderManagerThreadHolder::~"
                                "VideoDecoderManagerThreadHolder",
                                []() -> void {
                                  sVideoDecoderManagerThread->Shutdown();
@@ -116,7 +114,7 @@ void VideoDecoderManagerParent::StartupThreads() {
       NS_DISPATCH_NORMAL);
 #endif
   sVideoDecoderManagerThread->Dispatch(
-      NS_NewRunnableFunction("dom::VideoDecoderManagerParent::StartupThreads",
+      NS_NewRunnableFunction("VideoDecoderManagerParent::StartupThreads",
                              []() { layers::VideoBridgeChild::Startup(); }),
       NS_DISPATCH_NORMAL);
 
@@ -140,9 +138,9 @@ void VideoDecoderManagerParent::ShutdownThreads() {
 
 void VideoDecoderManagerParent::ShutdownVideoBridge() {
   if (sVideoDecoderManagerThread) {
-    RefPtr<Runnable> task = NS_NewRunnableFunction(
-        "dom::VideoDecoderManagerParent::ShutdownVideoBridge",
-        []() { VideoBridgeChild::Shutdown(); });
+    RefPtr<Runnable> task =
+        NS_NewRunnableFunction("VideoDecoderManagerParent::ShutdownVideoBridge",
+                               []() { VideoBridgeChild::Shutdown(); });
     SyncRunnable::DispatchToThread(sVideoDecoderManagerThread, task);
   }
 }
@@ -166,7 +164,7 @@ bool VideoDecoderManagerParent::CreateForContent(
 
   RefPtr<Runnable> task =
       NewRunnableMethod<Endpoint<PVideoDecoderManagerParent>&&>(
-          "dom::VideoDecoderManagerParent::Open", parent,
+          "VideoDecoderManagerParent::Open", parent,
           &VideoDecoderManagerParent::Open, std::move(aEndpoint));
   sVideoDecoderManagerThread->Dispatch(task.forget(), NS_DISPATCH_NORMAL);
   return true;
@@ -279,5 +277,4 @@ VideoDecoderManagerParent::RecvDeallocateSurfaceDescriptorGPUVideo(
   return IPC_OK();
 }
 
-}  // namespace dom
 }  // namespace mozilla
diff --git a/dom/media/ipc/VideoDecoderManagerParent.h b/dom/media/ipc/VideoDecoderManagerParent.h
index 8268be68c1b3..0449ec431628 100644
--- a/dom/media/ipc/VideoDecoderManagerParent.h
+++ b/dom/media/ipc/VideoDecoderManagerParent.h
@@ -3,13 +3,12 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#ifndef include_dom_ipc_VideoDecoderManagerParent_h
-#define include_dom_ipc_VideoDecoderManagerParent_h
+#ifndef include_ipc_VideoDecoderManagerParent_h
+#define include_ipc_VideoDecoderManagerParent_h
 
-#include "mozilla/dom/PVideoDecoderManagerParent.h"
+#include "mozilla/PVideoDecoderManagerParent.h"
 
 namespace mozilla {
-namespace dom {
 
 class VideoDecoderManagerThreadHolder;
 
@@ -62,7 +61,6 @@ class VideoDecoderManagerParent final : public PVideoDecoderManagerParent {
   RefPtr<VideoDecoderManagerThreadHolder> mThreadHolder;
 };
 
-}  // namespace dom
 }  // namespace mozilla
 
 #endif  // include_dom_ipc_VideoDecoderManagerParent_h
diff --git a/dom/media/ipc/VideoDecoderParent.cpp b/dom/media/ipc/VideoDecoderParent.cpp
index 54218375ae0b..84e47150b916 100644
--- a/dom/media/ipc/VideoDecoderParent.cpp
+++ b/dom/media/ipc/VideoDecoderParent.cpp
@@ -17,7 +17,6 @@
 #endif
 
 namespace mozilla {
-namespace dom {
 
 using base::Thread;
 using media::TimeUnit;
@@ -280,5 +279,4 @@ bool VideoDecoderParent::OnManagerThread() {
   return mParent->OnManagerThread();
 }
 
-}  // namespace dom
 }  // namespace mozilla
diff --git a/dom/media/ipc/VideoDecoderParent.h b/dom/media/ipc/VideoDecoderParent.h
index 5ce79f09e8d1..ce7d930892ca 100644
--- a/dom/media/ipc/VideoDecoderParent.h
+++ b/dom/media/ipc/VideoDecoderParent.h
@@ -3,19 +3,18 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-#ifndef include_dom_ipc_VideoDecoderParent_h
-#define include_dom_ipc_VideoDecoderParent_h
+#ifndef include_ipc_VideoDecoderParent_h
+#define include_ipc_VideoDecoderParent_h
 
 #include "ImageContainer.h"
 #include "MediaData.h"
 #include "PlatformDecoderModule.h"
 #include "VideoDecoderManagerParent.h"
 #include "mozilla/MozPromise.h"
-#include "mozilla/dom/PVideoDecoderParent.h"
+#include "mozilla/PVideoDecoderParent.h"
 #include "mozilla/layers/TextureForwarder.h"
 
 namespace mozilla {
-namespace dom {
 
 class KnowsCompositorVideo;
 
@@ -62,7 +61,6 @@ class VideoDecoderParent final : public PVideoDecoderParent {
   bool mDestroyed;
 };
 
-}  // namespace dom
 }  // namespace mozilla
 
-#endif  // include_dom_ipc_VideoDecoderParent_h
+#endif  // include_ipc_VideoDecoderParent_h
diff --git a/dom/media/ipc/moz.build b/dom/media/ipc/moz.build
index 2de32d3ec27b..e34c75318887 100644
--- a/dom/media/ipc/moz.build
+++ b/dom/media/ipc/moz.build
@@ -25,12 +25,12 @@ EXPORTS.mozilla += [
     'RemoteDecoderManagerParent.h',
     'RemoteDecoderModule.h',
     'RemoteMediaDataDecoder.h',
+    'VideoDecoderManagerChild.h',
+    'VideoDecoderManagerParent.h',
 ]
 
 EXPORTS.mozilla.dom += [
     'MediaIPCUtils.h',
-    'VideoDecoderManagerChild.h',
-    'VideoDecoderManagerParent.h',
 ]
 
 SOURCES += [
diff --git a/gfx/ipc/GPUParent.cpp b/gfx/ipc/GPUParent.cpp
index 3481ef6f7ee9..f0ce61bcbe43 100644
--- a/gfx/ipc/GPUParent.cpp
+++ b/gfx/ipc/GPUParent.cpp
@@ -17,9 +17,9 @@
 #include "mozilla/Assertions.h"
 #include "mozilla/Telemetry.h"
 #include "mozilla/TimeStamp.h"
+#include "mozilla/VideoDecoderManagerChild.h"
+#include "mozilla/VideoDecoderManagerParent.h"
 #include "mozilla/dom/MemoryReportRequest.h"
-#include "mozilla/dom/VideoDecoderManagerChild.h"
-#include "mozilla/dom/VideoDecoderManagerParent.h"
 #include "mozilla/gfx/2D.h"
 #include "mozilla/gfx/gfxVars.h"
 #include "mozilla/image/ImageMemoryReporter.h"
@@ -397,7 +397,7 @@ mozilla::ipc::IPCResult GPUParent::RecvNewContentVRManager(
 
 mozilla::ipc::IPCResult GPUParent::RecvNewContentVideoDecoderManager(
     Endpoint<PVideoDecoderManagerParent>&& aEndpoint) {
-  if (!dom::VideoDecoderManagerParent::CreateForContent(std::move(aEndpoint))) {
+  if (!VideoDecoderManagerParent::CreateForContent(std::move(aEndpoint))) {
     return IPC_FAIL_NO_REASON(this);
   }
   return IPC_OK();
@@ -485,7 +485,7 @@ void GPUParent::ActorDestroy(ActorDestroyReason aWhy) {
     mVsyncBridge->Shutdown();
     mVsyncBridge = nullptr;
   }
-  dom::VideoDecoderManagerParent::ShutdownVideoBridge();
+  VideoDecoderManagerParent::ShutdownVideoBridge();
   CompositorThreadHolder::Shutdown();
   // There is a case that RenderThread exists when gfxVars::UseWebRender() is
   // false. This could happen when WebRender was fallbacked to compositor.
diff --git a/gfx/ipc/GPUProcessManager.cpp b/gfx/ipc/GPUProcessManager.cpp
index 8e3ef93f8350..66167b55ec13 100644
--- a/gfx/ipc/GPUProcessManager.cpp
+++ b/gfx/ipc/GPUProcessManager.cpp
@@ -13,6 +13,8 @@
 #include "mozilla/Sprintf.h"
 #include "mozilla/StaticPtr.h"
 #include "mozilla/StaticPrefs.h"
+#include "mozilla/VideoDecoderManagerChild.h"
+#include "mozilla/VideoDecoderManagerParent.h"
 #include "mozilla/dom/ContentParent.h"
 #include "mozilla/gfx/gfxVars.h"
 #include "mozilla/layers/APZCTreeManagerChild.h"
@@ -37,8 +39,6 @@
 #include "VsyncBridgeChild.h"
 #include "VsyncIOThreadHolder.h"
 #include "VsyncSource.h"
-#include "mozilla/dom/VideoDecoderManagerChild.h"
-#include "mozilla/dom/VideoDecoderManagerParent.h"
 #include "nsExceptionHandler.h"
 #include "nsPrintfCString.h"
 
@@ -767,7 +767,7 @@ bool GPUProcessManager::CreateContentBridges(
     ipc::Endpoint<PCompositorManagerChild>* aOutCompositor,
     ipc::Endpoint<PImageBridgeChild>* aOutImageBridge,
     ipc::Endpoint<PVRManagerChild>* aOutVRBridge,
-    ipc::Endpoint<dom::PVideoDecoderManagerChild>* aOutVideoManager,
+    ipc::Endpoint<PVideoDecoderManagerChild>* aOutVideoManager,
     nsTArray<uint32_t>* aNamespaces) {
   if (!CreateContentCompositorManager(aOtherProcess, aOutCompositor) ||
       !CreateContentImageBridge(aOtherProcess, aOutImageBridge) ||
@@ -879,16 +879,16 @@ bool GPUProcessManager::CreateContentVRManager(
 
 void GPUProcessManager::CreateContentVideoDecoderManager(
     base::ProcessId aOtherProcess,
-    ipc::Endpoint<dom::PVideoDecoderManagerChild>* aOutEndpoint) {
+    ipc::Endpoint<PVideoDecoderManagerChild>* aOutEndpoint) {
   if (!EnsureGPUReady() || !StaticPrefs::MediaGpuProcessDecoder() ||
       !mDecodeVideoOnGpuProcess) {
     return;
   }
 
-  ipc::Endpoint<dom::PVideoDecoderManagerParent> parentPipe;
-  ipc::Endpoint<dom::PVideoDecoderManagerChild> childPipe;
+  ipc::Endpoint<PVideoDecoderManagerParent> parentPipe;
+  ipc::Endpoint<PVideoDecoderManagerChild> childPipe;
 
-  nsresult rv = dom::PVideoDecoderManager::CreateEndpoints(
+  nsresult rv = PVideoDecoderManager::CreateEndpoints(
       mGPUChild->OtherPid(), aOtherProcess, &parentPipe, &childPipe);
   if (NS_FAILED(rv)) {
     gfxCriticalNote << "Could not create content video decoder: "
diff --git a/gfx/ipc/GPUProcessManager.h b/gfx/ipc/GPUProcessManager.h
index 6698c7e238d5..67d65d10eec9 100644
--- a/gfx/ipc/GPUProcessManager.h
+++ b/gfx/ipc/GPUProcessManager.h
@@ -24,6 +24,7 @@ class nsBaseWidget;
 
 namespace mozilla {
 class MemoryReportingProcess;
+class PVideoDecoderManagerChild;
 namespace layers {
 class IAPZCTreeManager;
 class CompositorOptions;
@@ -42,7 +43,6 @@ class CompositorWidget;
 namespace dom {
 class ContentParent;
 class TabParent;
-class PVideoDecoderManagerChild;
 }  // namespace dom
 namespace ipc {
 class GeckoChildProcessHost;
@@ -101,7 +101,7 @@ class GPUProcessManager final : public GPUProcessHost::Listener {
       mozilla::ipc::Endpoint<PCompositorManagerChild>* aOutCompositor,
       mozilla::ipc::Endpoint<PImageBridgeChild>* aOutImageBridge,
       mozilla::ipc::Endpoint<PVRManagerChild>* aOutVRBridge,
-      mozilla::ipc::Endpoint<dom::PVideoDecoderManagerChild>* aOutVideoManager,
+      mozilla::ipc::Endpoint<PVideoDecoderManagerChild>* aOutVideoManager,
       nsTArray<uint32_t>* aNamespaces);
 
   // Maps the layer tree and process together so that aOwningPID is allowed
@@ -191,7 +191,7 @@ class GPUProcessManager final : public GPUProcessHost::Listener {
       mozilla::ipc::Endpoint<PVRManagerChild>* aOutEndpoint);
   void CreateContentVideoDecoderManager(
       base::ProcessId aOtherProcess,
-      mozilla::ipc::Endpoint<dom::PVideoDecoderManagerChild>* aOutEndPoint);
+      mozilla::ipc::Endpoint<PVideoDecoderManagerChild>* aOutEndPoint);
 
   // Called from RemoteCompositorSession. We track remote sessions so we can
   // notify their owning widgets that the session must be restarted.
diff --git a/gfx/layers/GPUVideoImage.h b/gfx/layers/GPUVideoImage.h
index 08f31be1c897..1be277926d8c 100644
--- a/gfx/layers/GPUVideoImage.h
+++ b/gfx/layers/GPUVideoImage.h
@@ -28,7 +28,7 @@ class GPUVideoImage final : public Image {
   friend class gl::GLBlitHelper;
 
  public:
-  GPUVideoImage(dom::VideoDecoderManagerChild* aManager,
+  GPUVideoImage(VideoDecoderManagerChild* aManager,
                 const SurfaceDescriptorGPUVideo& aSD, const gfx::IntSize& aSize)
       : Image(nullptr, ImageFormat::GPU_VIDEO), mSize(aSize) {
     // Create the TextureClient immediately since the GPUVideoTextureData
diff --git a/gfx/layers/client/GPUVideoTextureClient.cpp b/gfx/layers/client/GPUVideoTextureClient.cpp
index 20b4684b691d..4663d56c4c03 100644
--- a/gfx/layers/client/GPUVideoTextureClient.cpp
+++ b/gfx/layers/client/GPUVideoTextureClient.cpp
@@ -5,7 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "GPUVideoTextureClient.h"
-#include "mozilla/dom/VideoDecoderManagerChild.h"
+#include "mozilla/VideoDecoderManagerChild.h"
 #include "mozilla/gfx/2D.h"
 
 namespace mozilla {
@@ -13,9 +13,9 @@ namespace layers {
 
 using namespace gfx;
 
-GPUVideoTextureData::GPUVideoTextureData(
-    dom::VideoDecoderManagerChild* aManager,
-    const SurfaceDescriptorGPUVideo& aSD, const gfx::IntSize& aSize)
+GPUVideoTextureData::GPUVideoTextureData(VideoDecoderManagerChild* aManager,
+                                         const SurfaceDescriptorGPUVideo& aSD,
+                                         const gfx::IntSize& aSize)
     : mManager(aManager), mSD(aSD), mSize(aSize) {}
 
 GPUVideoTextureData::~GPUVideoTextureData() {}
diff --git a/gfx/layers/client/GPUVideoTextureClient.h b/gfx/layers/client/GPUVideoTextureClient.h
index 3b5ef684da4b..d8a9c493b8bd 100644
--- a/gfx/layers/client/GPUVideoTextureClient.h
+++ b/gfx/layers/client/GPUVideoTextureClient.h
@@ -13,14 +13,13 @@ namespace mozilla {
 namespace gfx {
 class SourceSurface;
 }
-namespace dom {
 class VideoDecoderManagerChild;
-}
+
 namespace layers {
 
 class GPUVideoTextureData : public TextureData {
  public:
-  GPUVideoTextureData(dom::VideoDecoderManagerChild* aManager,
+  GPUVideoTextureData(VideoDecoderManagerChild* aManager,
                       const SurfaceDescriptorGPUVideo& aSD,
                       const gfx::IntSize& aSize);
   ~GPUVideoTextureData();
@@ -42,7 +41,7 @@ class GPUVideoTextureData : public TextureData {
   virtual GPUVideoTextureData* AsGPUVideoTextureData() override { return this; }
 
  protected:
-  RefPtr<dom::VideoDecoderManagerChild> mManager;
+  RefPtr<VideoDecoderManagerChild> mManager;
   SurfaceDescriptorGPUVideo mSD;
   gfx::IntSize mSize;
 
diff --git a/gfx/layers/composite/GPUVideoTextureHost.cpp b/gfx/layers/composite/GPUVideoTextureHost.cpp
index 61876abf090b..4e38d2bb381a 100644
--- a/gfx/layers/composite/GPUVideoTextureHost.cpp
+++ b/gfx/layers/composite/GPUVideoTextureHost.cpp
@@ -5,7 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "GPUVideoTextureHost.h"
-#include "mozilla/dom/VideoDecoderManagerParent.h"
+#include "mozilla/VideoDecoderManagerParent.h"
 #include "ImageContainer.h"
 #include "mozilla/layers/VideoBridgeParent.h"
 
diff --git a/xpcom/build/XPCOMInit.cpp b/xpcom/build/XPCOMInit.cpp
index 810a6ca00acd..29778861f3c7 100644
--- a/xpcom/build/XPCOMInit.cpp
+++ b/xpcom/build/XPCOMInit.cpp
@@ -10,6 +10,7 @@
 #include "mozilla/Poison.h"
 #include "mozilla/RemoteDecoderManagerChild.h"
 #include "mozilla/SharedThreadPool.h"
+#include "mozilla/VideoDecoderManagerChild.h"
 #include "mozilla/XPCOM.h"
 #include "nsXULAppAPI.h"
 
@@ -22,7 +23,6 @@
 
 #include "mozilla/layers/ImageBridgeChild.h"
 #include "mozilla/layers/CompositorBridgeParent.h"
-#include "mozilla/dom/VideoDecoderManagerChild.h"
 
 #include "prlink.h"
 
@@ -815,7 +815,7 @@ nsresult ShutdownXPCOM(nsIServiceManager* aServMgr) {
     // are triggered by the NS_XPCOM_SHUTDOWN_OBSERVER_ID notification.
     NS_ProcessPendingEvents(thread);
     gfxPlatform::ShutdownLayersIPC();
-    mozilla::dom::VideoDecoderManagerChild::Shutdown();
+    mozilla::VideoDecoderManagerChild::Shutdown();
     mozilla::RemoteDecoderManagerChild::Shutdown();
 
     mozilla::scache::StartupCache::DeleteSingleton();