diff --git a/gfx/layers/ipc/CompositorParent.cpp b/gfx/layers/ipc/CompositorParent.cpp
index 1aa3296e826..34d61f3f7a0 100644
--- a/gfx/layers/ipc/CompositorParent.cpp
+++ b/gfx/layers/ipc/CompositorParent.cpp
@@ -979,19 +979,11 @@ CompositorParent::AllocateLayerTreeId()
 }
 
 static void
-EraseLayerState(uint64_t aId)
+RemoveIndirectTree(uint64_t aId)
 {
   sIndirectLayerTrees.erase(aId);
 }
 
-/*static*/ void
-CompositorParent::DeallocateLayerTreeId(uint64_t aId)
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  CompositorLoop()->PostTask(FROM_HERE,
-                             NewRunnableFunction(&EraseLayerState, aId));
-}
-
 static void
 UpdateControllerForLayersId(uint64_t aLayersId,
                             GeckoContentController* aController)
@@ -1185,12 +1177,6 @@ CompositorParent::GetIndirectShadowTree(uint64_t aId)
   return &cit->second;
 }
 
-static void
-RemoveIndirectTree(uint64_t aId)
-{
-  sIndirectLayerTrees.erase(aId);
-}
-
 void
 CrossProcessCompositorParent::ActorDestroy(ActorDestroyReason aWhy)
 {
diff --git a/gfx/layers/ipc/CompositorParent.h b/gfx/layers/ipc/CompositorParent.h
index b0cc866524b..c49fb8e4599 100644
--- a/gfx/layers/ipc/CompositorParent.h
+++ b/gfx/layers/ipc/CompositorParent.h
@@ -164,12 +164,6 @@ public:
    * Must run on the content main thread.
    */
   static uint64_t AllocateLayerTreeId();
-  /**
-   * Release compositor-thread resources referred to by |aID|.
-   *
-   * Must run on the content main thread.
-   */
-  static void DeallocateLayerTreeId(uint64_t aId);
 
   /**
    * Set aController as the pan/zoom callback for the subtree referred
diff --git a/layout/ipc/RenderFrameParent.cpp b/layout/ipc/RenderFrameParent.cpp
index c5a841ef106..02902fd3d09 100644
--- a/layout/ipc/RenderFrameParent.cpp
+++ b/layout/ipc/RenderFrameParent.cpp
@@ -942,7 +942,6 @@ void
 RenderFrameParent::ActorDestroy(ActorDestroyReason why)
 {
   if (mLayersId != 0) {
-    CompositorParent::DeallocateLayerTreeId(mLayersId);
     if (mContentController) {
       // Stop our content controller from requesting repaints of our
       // content.