Move a bunch of content\common code into the content namespace.

content/browser/gpu/gpu_surface_tracker.cc

 // 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.
 
 #include "content/browser/gpu/gpu_surface_tracker.h"
 
 #include "base/logging.h"
 
+namespace content {
+
 GpuSurfaceTracker::GpuSurfaceTracker()
     : next_surface_id_(1) {
   GpuSurfaceLookup::InitInstance(this);
 }
 
 GpuSurfaceTracker::~GpuSurfaceTracker() {
   GpuSurfaceLookup::InitInstance(NULL);
 }
 
 GpuSurfaceTracker* GpuSurfaceTracker::GetInstance() {
@@ skipping 78 matching lines @@
   return it->second.handle.handle;
 }
 
 gfx::AcceleratedWidget GpuSurfaceTracker::GetNativeWidget(int surface_id) {
   base::AutoLock lock(lock_);
   SurfaceMap::iterator it = surface_map_.find(surface_id);
   if (it == surface_map_.end())
     return gfx::kNullAcceleratedWidget;
   return it->second.native_widget;
 }
+
+}  // namespace content