Removed "compositor" child window that was created by the GPU process.

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
===================================================================
--- content/common/gpu/gpu_command_buffer_stub.h	(revision 83213)
+++ content/common/gpu/gpu_command_buffer_stub.h	(working copy)
@@ -68,6 +68,8 @@
   void OnCompositorWindowPainted();
 #endif  // defined(OS_WIN)
 
+  void ViewResized();
+
 #if defined(OS_MACOSX)
   // Called only by the GpuChannel.
   void AcceleratedSurfaceBuffersSwapped(uint64 swap_buffers_count);
@@ -101,10 +103,6 @@
   void SwapBuffersCallback();
 #endif  // defined(OS_MACOSX)
 
-#if defined(OS_WIN)
-  bool CreateCompositorWindow();
-#endif  // defined(OS_WIN)
-
   void ResizeCallback(gfx::Size size);
 
   // The lifetime of objects of this class is managed by a GpuChannel. The
@@ -121,10 +119,6 @@
   uint32 parent_texture_id_;
   int32 route_id_;
 
-#if defined(OS_WIN)
-  HWND compositor_window_;
-#endif  // defined(OS_WIN)
-
   // The following two fields are used on Mac OS X to identify the window
   // for the rendering results on the browser side.
   int32 renderer_id_;