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_tracking.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_COMMON_GPU_GPU_MEMORY_TRACKING_H_
 #define CONTENT_COMMON_GPU_GPU_MEMORY_TRACKING_H_
 
 #if defined(ENABLE_GPU)
 
 #include "base/basictypes.h"
 #include "content/common/gpu/gpu_memory_manager.h"
 
+namespace content {
+
 // All decoders in a context group point to a single GpuMemoryTrackingGroup,
 // which tracks GPU resource consumption for the entire context group.
 class GpuMemoryTrackingGroup {
  public:
   GpuMemoryTrackingGroup(base::ProcessId pid, GpuMemoryManager* memory_manager)
       : pid_(pid),
         size_(0),
         memory_manager_(memory_manager) {
     memory_manager_->AddTrackingGroup(this);
   }
@@ skipping 18 matching lines @@
   size_t GetSize() const {
     return size_;
   }
 
  private:
   base::ProcessId pid_;
   size_t size_;
   GpuMemoryManager* memory_manager_;
 };
 
+}  // namespace content
+
 #endif
 
 #endif // CONTENT_COMMON_GPU_GPU_MEMORY_TRACKING_H_