Fix layering violation where content is included by gpu.

content/renderer/pepper/pepper_platform_context_3d_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 38 matching lines @@
   bool InitRaw();
   void OnContextLost();
   void OnConsoleMessage(const std::string& msg, int id);
 
   // Implicitly weak pointer; must outlive this instance.
   PepperParentContextProvider* parent_context_provider_;
   base::WeakPtr<WebGraphicsContext3DCommandBufferImpl> parent_context_;
   scoped_refptr<GpuChannelHost> channel_;
   unsigned int parent_texture_id_;
   bool has_alpha_;
-  CommandBufferProxy* command_buffer_;
+  CommandBufferProxyImpl* command_buffer_;
   base::Closure context_lost_callback_;
   ConsoleMessageCallback console_message_callback_;
   base::WeakPtrFactory<PlatformContext3DImpl> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // ENABLE_GPU
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_CONTEXT_3D_IMPL_H_