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

content/common/gpu/gpu_channel_manager.cc

Index: content/common/gpu/gpu_channel_manager.cc
===================================================================
--- content/common/gpu/gpu_channel_manager.cc	(revision 163290)
+++ content/common/gpu/gpu_channel_manager.cc	(working copy)
@@ -18,6 +18,8 @@
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_share_group.h"
 
+namespace content {
+
 GpuChannelManager::ImageOperation::ImageOperation(
     int32 sync_point, base::Closure callback)
     : sync_point(sync_point),
@@ -274,3 +276,5 @@
   }
   return default_offscreen_surface_.get();
 }
+
+}  // namespace content