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

content/renderer/render_process.h

Index: content/renderer/render_process.h
===================================================================
--- content/renderer/render_process.h	(revision 163290)
+++ content/renderer/render_process.h	(working copy)
@@ -18,6 +18,8 @@
 class PlatformCanvas;
 }
 
+namespace content {
+
 // A abstract interface representing the renderer end of the browser<->renderer
 // connection. The opposite end is the RenderProcessHost. This is a singleton
 // object for each renderer.
@@ -70,4 +72,6 @@
   DISALLOW_COPY_AND_ASSIGN(RenderProcess);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_RENDER_PROCESS_H_