diff --git a/gfx/layers/ipc/CompositorBridgeChild.cpp b/gfx/layers/ipc/CompositorBridgeChild.cpp
index dc6abe4090a6..1df19ca0f789 100644
--- a/gfx/layers/ipc/CompositorBridgeChild.cpp
+++ b/gfx/layers/ipc/CompositorBridgeChild.cpp
@@ -89,8 +89,6 @@ CompositorBridgeChild::CompositorBridgeChild(CompositorManagerChild* aManager)
       mSectionAllocator(nullptr),
       mPaintLock("CompositorBridgeChild.mPaintLock"),
       mTotalAsyncPaints(0),
-      mOutstandingAsyncPaints(0),
-      mOutstandingAsyncEndTransaction(false),
       mIsDelayingForAsyncPaints(false),
       mSlowFlushCount(0),
       mTotalFlushCount(0) {
@@ -757,16 +755,5 @@ wr::PipelineId CompositorBridgeChild::GetNextPipelineId() {
   return wr::AsPipelineId(GetNextResourceId());
 }
 
-bool CompositorBridgeChild::NotifyBeginAsyncEndLayerTransaction(
-    SyncObjectClient* aSyncObject) {
-  MOZ_ASSERT(NS_IsMainThread());
-  MonitorAutoLock lock(mPaintLock);
-
-  MOZ_ASSERT(!mOutstandingAsyncEndTransaction);
-  mOutstandingAsyncEndTransaction = true;
-  mOutstandingAsyncSyncObject = aSyncObject;
-  return mOutstandingAsyncPaints == 0;
-}
-
 }  // namespace layers
 }  // namespace mozilla
diff --git a/gfx/layers/ipc/CompositorBridgeChild.h b/gfx/layers/ipc/CompositorBridgeChild.h
index 6e72565eaffd..b6ae32260cfd 100644
--- a/gfx/layers/ipc/CompositorBridgeChild.h
+++ b/gfx/layers/ipc/CompositorBridgeChild.h
@@ -200,14 +200,6 @@ class CompositorBridgeChild final : public PCompositorBridgeChild,
 
   wr::PipelineId GetNextPipelineId();
 
-  // Must only be called from the main thread. Notifies the CompositorBridge
-  // that all work has been submitted to the paint thread or paint worker
-  // threads, and returns whether all paints are completed. If this returns
-  // true, then an AsyncEndLayerTransaction must be queued, otherwise once
-  // NotifyFinishedAsyncWorkerPaint returns true, an AsyncEndLayerTransaction
-  // must be executed.
-  bool NotifyBeginAsyncEndLayerTransaction(SyncObjectClient* aSyncObject);
-
  private:
   // Private destructor, to discourage deletion outside of Release():
   virtual ~CompositorBridgeChild();
@@ -286,15 +278,6 @@ class CompositorBridgeChild final : public PCompositorBridgeChild,
   size_t mTotalAsyncPaints;
   TimeStamp mAsyncTransactionBegin;
 
-  // Contains the number of outstanding asynchronous paints tied to a
-  // PLayerTransaction on this bridge. This is R/W on both the main and paint
-  // threads, and must be accessed within the paint lock.
-  size_t mOutstandingAsyncPaints;
-
-  // Whether we are waiting for an async paint end transaction
-  bool mOutstandingAsyncEndTransaction;
-  RefPtr<SyncObjectClient> mOutstandingAsyncSyncObject;
-
   // True if this CompositorBridge is currently delaying its messages until the
   // paint thread completes. This is R/W on both the main and paint threads, and
   // must be accessed within the paint lock.