Bug 1729476 - Remove unused CompositorBridgeChild::WillEndTransaction(). r=gfx-reviewers,nical

Differential Revision: https://phabricator.services.mozilla.com/D124814

gfx/layers/ipc/CompositorBridgeChild.cpp

@@ -708,8 +708,6 @@ bool CompositorBridgeChild::DeallocPAPZCTreeManagerChild(
 
 // -
 
-void CompositorBridgeChild::WillEndTransaction() { ResetShmemCounter(); }
-
 PWebRenderBridgeChild* CompositorBridgeChild::AllocPWebRenderBridgeChild(
     const wr::PipelineId& aPipelineId, const LayoutDeviceIntSize&,
     const WindowKind&) {

gfx/layers/ipc/CompositorBridgeChild.h

@@ -186,8 +186,6 @@ class CompositorBridgeChild final : public PCompositorBridgeChild,
   PAPZChild* AllocPAPZChild(const LayersId& aLayersId);
   bool DeallocPAPZChild(PAPZChild* aActor);
 
-  void WillEndTransaction();
-
   PWebRenderBridgeChild* AllocPWebRenderBridgeChild(
       const wr::PipelineId& aPipelineId, const LayoutDeviceIntSize&,
       const WindowKind&);