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_mac.cc

Index: content/common/gpu/image_transport_surface_mac.cc
===================================================================
--- content/common/gpu/image_transport_surface_mac.cc	(revision 163290)
+++ content/common/gpu/image_transport_surface_mac.cc	(working copy)
@@ -16,6 +16,7 @@
 #include "ui/gl/gl_surface_cgl.h"
 #include "ui/surface/io_surface_support_mac.h"
 
+namespace content {
 namespace {
 
 // IOSurface dimensions will be rounded up to a multiple of this value in order
@@ -438,4 +439,6 @@
     return NULL;
 }
 
+}  // namespace content
+
 #endif  // defined(USE_GPU)