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

content/common/gpu/image_transport_surface.cc

Index: content/common/gpu/image_transport_surface.cc
===================================================================
--- content/common/gpu/image_transport_surface.cc	(revision 163290)
+++ content/common/gpu/image_transport_surface.cc	(working copy)
@@ -18,6 +18,8 @@
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/gl_implementation.h"
 
+namespace content {
+
 ImageTransportSurface::ImageTransportSurface() {}
 
 ImageTransportSurface::~ImageTransportSurface() {}
@@ -337,4 +339,6 @@
 
 PassThroughImageTransportSurface::~PassThroughImageTransportSurface() {}
 
+}  // namespace content
+
 #endif  // defined(ENABLE_GPU)