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

content/common/gpu/gpu_memory_manager.h

Index: content/common/gpu/gpu_memory_manager.h
===================================================================
--- content/common/gpu/gpu_memory_manager.h	(revision 163290)
+++ content/common/gpu/gpu_memory_manager.h	(working copy)
@@ -19,20 +19,24 @@
 #include "content/public/common/gpu_memory_stats.h"
 #include "ui/gfx/size.h"
 
+namespace content {
 class GpuCommandBufferStubBase;
-class GpuMemoryTrackingGroup;
+}
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
 template<>
-struct hash<GpuCommandBufferStubBase*> {
-  size_t operator()(GpuCommandBufferStubBase* ptr) const {
+struct hash<content::GpuCommandBufferStubBase*> {
+  size_t operator()(content::GpuCommandBufferStubBase* ptr) const {
     return hash<size_t>()(reinterpret_cast<size_t>(ptr));
   }
 };
 } // namespace BASE_HASH_NAMESPACE
 #endif // COMPILER
 
+namespace content {
+class GpuMemoryTrackingGroup;
+
 class CONTENT_EXPORT GpuMemoryManagerClient {
 public:
   virtual ~GpuMemoryManagerClient() {}
@@ -176,6 +180,8 @@
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryManager);
 };
 
+}  // namespace content
+
 #endif
 
 #endif // CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_