diff --git a/dom/media/VideoUtils.cpp b/dom/media/VideoUtils.cpp
index 79c83be18761..ac8b1c912a51 100644
--- a/dom/media/VideoUtils.cpp
+++ b/dom/media/VideoUtils.cpp
@@ -14,6 +14,8 @@
 #include "mozilla/Base64.h"
 #include "nsIRandomGenerator.h"
 #include "nsIServiceManager.h"
+#include "MediaTaskQueue.h"
+
 #include <stdint.h>
 
 namespace mozilla {
@@ -269,5 +271,24 @@ GenerateRandomPathName(nsCString& aOutSalt, uint32_t aLength)
   return NS_OK;
 }
 
+class CreateTaskQueueTask : public nsRunnable {
+public:
+  NS_IMETHOD Run() {
+    MOZ_ASSERT(NS_IsMainThread());
+    mTaskQueue = new MediaTaskQueue(GetMediaDecodeThreadPool());
+    return NS_OK;
+  }
+  nsRefPtr<MediaTaskQueue> mTaskQueue;
+};
+
+already_AddRefed<MediaTaskQueue>
+CreateMediaDecodeTaskQueue()
+{
+  // We must create the MediaTaskQueue/SharedThreadPool on the main thread.
+  nsRefPtr<CreateTaskQueueTask> t(new CreateTaskQueueTask());
+  nsresult rv = NS_DispatchToMainThread(t, NS_DISPATCH_SYNC);
+  NS_ENSURE_SUCCESS(rv, nullptr);
+  return t->mTaskQueue.forget();
+}
 
 } // end namespace mozilla
diff --git a/dom/media/VideoUtils.h b/dom/media/VideoUtils.h
index ffef9304049d..db9e837c8df6 100644
--- a/dom/media/VideoUtils.h
+++ b/dom/media/VideoUtils.h
@@ -263,6 +263,11 @@ ExtractH264CodecDetails(const nsAString& aCodecs,
 nsresult
 GenerateRandomPathName(nsCString& aOutSalt, uint32_t aLength);
 
+class MediaTaskQueue;
+
+already_AddRefed<MediaTaskQueue>
+CreateMediaDecodeTaskQueue();
+
 } // end namespace mozilla
 
 #endif
diff --git a/dom/media/fmp4/PlatformDecoderModule.cpp b/dom/media/fmp4/PlatformDecoderModule.cpp
index b4c5ab0c0783..d2bb0a4bd0aa 100644
--- a/dom/media/fmp4/PlatformDecoderModule.cpp
+++ b/dom/media/fmp4/PlatformDecoderModule.cpp
@@ -75,26 +75,6 @@ PlatformDecoderModule::Init()
 }
 
 #ifdef MOZ_EME
-class CreateTaskQueueTask : public nsRunnable {
-public:
-  NS_IMETHOD Run() {
-    MOZ_ASSERT(NS_IsMainThread());
-    mTaskQueue = new MediaTaskQueue(GetMediaDecodeThreadPool());
-    return NS_OK;
-  }
-  nsRefPtr<MediaTaskQueue> mTaskQueue;
-};
-
-static already_AddRefed<MediaTaskQueue>
-CreateTaskQueue()
-{
-  // We must create the MediaTaskQueue/SharedThreadPool on the main thread.
-  nsRefPtr<CreateTaskQueueTask> t(new CreateTaskQueueTask());
-  nsresult rv = NS_DispatchToMainThread(t, NS_DISPATCH_SYNC);
-  NS_ENSURE_SUCCESS(rv, nullptr);
-  return t->mTaskQueue.forget();
-}
-
 /* static */
 PlatformDecoderModule*
 PlatformDecoderModule::CreateCDMWrapper(CDMProxy* aProxy,
@@ -123,8 +103,7 @@ PlatformDecoderModule::CreateCDMWrapper(CDMProxy* aProxy,
   return new EMEDecoderModule(aProxy,
                               pdm.forget(),
                               cdmDecodesAudio,
-                              cdmDecodesVideo,
-                              CreateTaskQueue());
+                              cdmDecodesVideo);
 }
 #endif
 
diff --git a/dom/media/fmp4/eme/EMEDecoderModule.cpp b/dom/media/fmp4/eme/EMEDecoderModule.cpp
index 0b9577bbaeea..e60752baab18 100644
--- a/dom/media/fmp4/eme/EMEDecoderModule.cpp
+++ b/dom/media/fmp4/eme/EMEDecoderModule.cpp
@@ -20,6 +20,7 @@
 #include "mozilla/EMELog.h"
 #include "EMEH264Decoder.h"
 #include "EMEAudioDecoder.h"
+#include "mozilla/unused.h"
 #include <string>
 
 namespace mozilla {
@@ -31,19 +32,19 @@ public:
 
   EMEDecryptor(MediaDataDecoder* aDecoder,
                MediaDataDecoderCallback* aCallback,
-               MediaTaskQueue* aTaskQueue,
                CDMProxy* aProxy)
     : mDecoder(aDecoder)
     , mCallback(aCallback)
-    , mTaskQueue(aTaskQueue)
+    , mTaskQueue(CreateMediaDecodeTaskQueue())
     , mProxy(aProxy)
   {
   }
 
   virtual nsresult Init() MOZ_OVERRIDE {
-    return mTaskQueue->SyncDispatch(
-      NS_NewRunnableMethod(mDecoder,
-      &MediaDataDecoder::Init));
+    nsresult rv = mTaskQueue->SyncDispatch(
+      NS_NewRunnableMethod(mDecoder, &MediaDataDecoder::Init));
+    unused << NS_WARN_IF(NS_FAILED(rv));
+    return rv;
   }
 
   class RedeliverEncryptedInput : public nsRunnable {
@@ -123,40 +124,44 @@ public:
   }
 
   void Decrypted(mp4_demuxer::MP4Sample* aSample) {
-    mTaskQueue->Dispatch(
+    nsresult rv = mTaskQueue->Dispatch(
       NS_NewRunnableMethodWithArg<mp4_demuxer::MP4Sample*>(
         mDecoder,
         &MediaDataDecoder::Input,
         aSample));
+    unused << NS_WARN_IF(NS_FAILED(rv));
   }
 
   virtual nsresult Flush() MOZ_OVERRIDE {
-    mTaskQueue->SyncDispatch(
+    nsresult rv = mTaskQueue->SyncDispatch(
       NS_NewRunnableMethod(
         mDecoder,
         &MediaDataDecoder::Flush));
-    return NS_OK;
+    unused << NS_WARN_IF(NS_FAILED(rv));
+    return rv;
   }
 
   virtual nsresult Drain() MOZ_OVERRIDE {
-    mTaskQueue->Dispatch(
+    nsresult rv = mTaskQueue->Dispatch(
       NS_NewRunnableMethod(
         mDecoder,
         &MediaDataDecoder::Drain));
-    return NS_OK;
+    unused << NS_WARN_IF(NS_FAILED(rv));
+    return rv;
   }
 
   virtual nsresult Shutdown() MOZ_OVERRIDE {
-    mTaskQueue->SyncDispatch(
+    nsresult rv = mTaskQueue->SyncDispatch(
       NS_NewRunnableMethod(
         mDecoder,
         &MediaDataDecoder::Shutdown));
+    unused << NS_WARN_IF(NS_FAILED(rv));
     mDecoder = nullptr;
     mTaskQueue->BeginShutdown();
     mTaskQueue->AwaitShutdownAndIdle();
     mTaskQueue = nullptr;
     mProxy = nullptr;
-    return NS_OK;
+    return rv;
   }
 
 private:
@@ -170,11 +175,9 @@ private:
 EMEDecoderModule::EMEDecoderModule(CDMProxy* aProxy,
                                    PlatformDecoderModule* aPDM,
                                    bool aCDMDecodesAudio,
-                                   bool aCDMDecodesVideo,
-                                   already_AddRefed<MediaTaskQueue> aTaskQueue)
+                                   bool aCDMDecodesVideo)
   : mProxy(aProxy)
   , mPDM(aPDM)
-  , mTaskQueue(aTaskQueue)
   , mCDMDecodesAudio(aCDMDecodesAudio)
   , mCDMDecodesVideo(aCDMDecodesVideo)
 {
@@ -190,8 +193,6 @@ EMEDecoderModule::Shutdown()
   if (mPDM) {
     return mPDM->Shutdown();
   }
-  mTaskQueue->BeginShutdown();
-  mTaskQueue->AwaitShutdownAndIdle();
   return NS_OK;
 }
 
@@ -227,7 +228,6 @@ EMEDecoderModule::CreateVideoDecoder(const VideoDecoderConfig& aConfig,
 
   nsRefPtr<MediaDataDecoder> emeDecoder(new EMEDecryptor(decoder,
                                                          aCallback,
-                                                         mTaskQueue,
                                                          mProxy));
   return emeDecoder.forget();
 }
@@ -258,7 +258,6 @@ EMEDecoderModule::CreateAudioDecoder(const AudioDecoderConfig& aConfig,
 
   nsRefPtr<MediaDataDecoder> emeDecoder(new EMEDecryptor(decoder,
                                                          aCallback,
-                                                         mTaskQueue,
                                                          mProxy));
   return emeDecoder.forget();
 }
diff --git a/dom/media/fmp4/eme/EMEDecoderModule.h b/dom/media/fmp4/eme/EMEDecoderModule.h
index 8bd9953800a5..cafe7ba1ba44 100644
--- a/dom/media/fmp4/eme/EMEDecoderModule.h
+++ b/dom/media/fmp4/eme/EMEDecoderModule.h
@@ -24,8 +24,7 @@ public:
   EMEDecoderModule(CDMProxy* aProxy,
                    PlatformDecoderModule* aPDM,
                    bool aCDMDecodesAudio,
-                   bool aCDMDecodesVideo,
-                   already_AddRefed<MediaTaskQueue> aDecodeTaskQueue);
+                   bool aCDMDecodesVideo);
 
   virtual ~EMEDecoderModule();