cc: Move GpuMemoryBufferManager interface to gpu namespace.

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index fb297685414e04402b453b92522789345f8852f8..065e8b42f2567f90bfdef3b4ac3ec8b84d216c25 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -34,7 +34,6 @@ class RunLoop;
 
 namespace cc {
 class ContextProvider;
-class GpuMemoryBufferManager;
 class Layer;
 class LayerTreeDebugState;
 class LayerTreeHost;
@@ -48,6 +47,7 @@ class Size;
 }
 
 namespace gpu {
+class GpuMemoryBufferManager;
 struct Mailbox;
 }
 
@@ -96,7 +96,7 @@ class COMPOSITOR_EXPORT ContextFactory {
   virtual cc::SharedBitmapManager* GetSharedBitmapManager() = 0;
 
   // Gets the GPU memory buffer manager.
-  virtual cc::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
+  virtual gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
 
   // Gets the compositor message loop, or NULL if not using threaded
   // compositing.