--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -2727,21 +2727,17 @@ TabChild::MakeVisible()
 
 void
 TabChild::MakeHidden()
 {
   if (mPuppetWidget && !mPuppetWidget->IsVisible()) {
     return;
   }
 
-  CompositorBridgeChild* compositor = CompositorBridgeChild::Get();
-
-  // Clear cached resources directly. This avoids one extra IPC
-  // round-trip from CompositorBridgeChild to CompositorBridgeParent.
-  compositor->RecvClearCachedResources(mLayersId);
+  ClearCachedResources();
 
   // Hide all plugins in this tab.
   if (nsCOMPtr<nsIPresShell> shell = GetPresShell()) {
     if (nsPresContext* presContext = shell->GetPresContext()) {
       nsRootPresContext* rootPresContext = presContext->GetRootPresContext();
       nsIFrame* rootFrame = shell->FrameConstructor()->GetRootFrame();
       rootPresContext->ComputePluginGeometryUpdates(rootFrame, nullptr, nullptr);
       rootPresContext->ApplyPluginGeometryUpdates();

--- a/gfx/layers/ipc/CompositorBridgeChild.cpp
+++ b/gfx/layers/ipc/CompositorBridgeChild.cpp
@@ -580,26 +580,16 @@ CompositorBridgeChild::RecvDidComposite(
 
   for (size_t i = 0; i < mTexturePools.Length(); i++) {
     mTexturePools[i]->ReturnDeferredClients();
   }
 
   return IPC_OK();
 }
 
-mozilla::ipc::IPCResult
-CompositorBridgeChild::RecvClearCachedResources(const uint64_t& aId)
-{
-  dom::TabChild* child = dom::TabChild::GetFrom(aId);
-  if (child) {
-    child->ClearCachedResources();
-  }
-  return IPC_OK();
-}
-
 void
 CompositorBridgeChild::ActorDestroy(ActorDestroyReason aWhy)
 {
   if (aWhy == AbnormalShutdown) {
     // If the parent side runs into a problem then the actor will be destroyed.
     // There is nothing we can do in the child side, here sets mCanSend as false.
     gfxCriticalNote << "Receive IPC close with reason=AbnormalShutdown";
   }

--- a/gfx/layers/ipc/CompositorBridgeChild.h
+++ b/gfx/layers/ipc/CompositorBridgeChild.h
@@ -89,19 +89,16 @@ public:
 
   static bool ChildProcessHasCompositorBridge();
 
   // Returns whether the compositor is in the GPU process (false if in the UI
   // process). This may only be called on the main thread.
   static bool CompositorIsInGPUProcess();
 
   virtual mozilla::ipc::IPCResult
-  RecvClearCachedResources(const uint64_t& id) override;
-
-  virtual mozilla::ipc::IPCResult
   RecvDidComposite(const uint64_t& aId, const uint64_t& aTransactionId,
                    const TimeStamp& aCompositeStart,
                    const TimeStamp& aCompositeEnd) override;
 
   virtual mozilla::ipc::IPCResult
   RecvInvalidateLayers(const uint64_t& aLayersId) override;
 
   virtual mozilla::ipc::IPCResult

--- a/gfx/layers/ipc/PCompositorBridge.ipdl
+++ b/gfx/layers/ipc/PCompositorBridge.ipdl
@@ -121,22 +121,16 @@ child:
   async CaptureAllPlugins(uintptr_t aParentWidget);
 
   /**
    * Hides all registered plugin widgets associated with a particular chrome
    * widget.
    */
   async HideAllPlugins(uintptr_t aParentWidget);
 
-  /**
-   * Drop any buffers that might be retained on the child compositor
-   * side.
-   */
-  async ClearCachedResources(uint64_t id);
-
   async ParentAsyncMessages(AsyncParentMessageData[] aMessages);
 
   async ObserveLayerUpdate(uint64_t aLayersId, uint64_t aEpoch, bool aActive);
 
 parent:
   // Must be called before Initialize().
   async PCompositorWidget(CompositorWidgetInitData aInitData);