Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/common/gpu/client/command_buffer_proxy_impl.h

Index: content/common/gpu/client/command_buffer_proxy_impl.h
===================================================================
--- content/common/gpu/client/command_buffer_proxy_impl.h	(revision 163290)
+++ content/common/gpu/client/command_buffer_proxy_impl.h	(working copy)
@@ -23,14 +23,16 @@
 #include "gpu/command_buffer/common/command_buffer_shared.h"
 #include "ipc/ipc_listener.h"
 
-class GpuChannelHost;
 struct GPUCommandBufferConsoleMessage;
-struct GpuMemoryAllocationForRenderer;
 
 namespace base {
 class SharedMemory;
 }
 
+namespace content {
+class GpuChannelHost;
+struct GpuMemoryAllocationForRenderer;
+
 // Client side proxy that forwards messages synchronously to a
 // CommandBufferStub.
 class CommandBufferProxyImpl
@@ -169,6 +171,8 @@
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxyImpl);
 };
 
+}  // namespace content
+
 #endif  // ENABLE_GPU
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_