--- a/gfx/layers/ipc/CompositorBridgeParent.h
+++ b/gfx/layers/ipc/CompositorBridgeParent.h
@@ -486,20 +486,16 @@ public:
   Maybe<TimeStamp> GetTestingTimeStamp() const;
 
   static CompositorBridgeParent* GetCompositorBridgeParentFromLayersId(const uint64_t& aLayersId);
 
 #if defined(MOZ_WIDGET_ANDROID)
   gfx::IntSize GetEGLSurfaceSize() {
     return mEGLSurfaceSize;
   }
-
-  uint64_t GetRootLayerTreeId() {
-    return mRootLayerTreeID;
-  }
 #endif // defined(MOZ_WIDGET_ANDROID)
 
 private:
 
   void Initialize();
 
   /**
    * Called during destruction in order to release resources as early as possible.