--- a/gfx/layers/ipc/CompositorManagerChild.h
+++ b/gfx/layers/ipc/CompositorManagerChild.h
@@ -14,38 +14,39 @@
 #include "mozilla/StaticPtr.h"   // for StaticRefPtr
 #include "mozilla/layers/PCompositorManagerChild.h"
 
 namespace mozilla {
 namespace layers {
 
 class CompositorBridgeChild;
 class CompositorManagerParent;
-class LayerManager;
+class WebRenderLayerManager;
 
 class CompositorManagerChild : public PCompositorManagerChild {
   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorManagerChild)
 
  public:
   static bool IsInitialized(uint64_t aProcessToken);
   static void InitSameProcess(uint32_t aNamespace, uint64_t aProcessToken);
   static bool Init(Endpoint<PCompositorManagerChild>&& aEndpoint,
                    uint32_t aNamespace, uint64_t aProcessToken = 0);
   static void Shutdown();
   static void OnGPUProcessLost(uint64_t aProcessToken);
 
   static bool CreateContentCompositorBridge(uint32_t aNamespace);
 
   static already_AddRefed<CompositorBridgeChild> CreateWidgetCompositorBridge(
-      uint64_t aProcessToken, LayerManager* aLayerManager, uint32_t aNamespace,
-      CSSToLayoutDeviceScale aScale, const CompositorOptions& aOptions,
-      bool aUseExternalSurfaceSize, const gfx::IntSize& aSurfaceSize);
+      uint64_t aProcessToken, WebRenderLayerManager* aLayerManager,
+      uint32_t aNamespace, CSSToLayoutDeviceScale aScale,
+      const CompositorOptions& aOptions, bool aUseExternalSurfaceSize,
+      const gfx::IntSize& aSurfaceSize);
 
   static already_AddRefed<CompositorBridgeChild>
-  CreateSameProcessWidgetCompositorBridge(LayerManager* aLayerManager,
+  CreateSameProcessWidgetCompositorBridge(WebRenderLayerManager* aLayerManager,
                                           uint32_t aNamespace);
 
   static CompositorManagerChild* GetInstance() {
     MOZ_ASSERT(NS_IsMainThread());
     return sInstance;
   }
 
   bool CanSend() const {