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

content/renderer/render_widget_fullscreen_pepper.h

Index: content/renderer/render_widget_fullscreen_pepper.h
===================================================================
--- content/renderer/render_widget_fullscreen_pepper.h	(revision 163290)
+++ content/renderer/render_widget_fullscreen_pepper.h	(working copy)
@@ -15,8 +15,6 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebWidget.h"
 #include "webkit/plugins/ppapi/fullscreen_container.h"
 
-class WebGraphicsContext3DCommandBufferImpl;
-
 namespace webkit {
 namespace ppapi {
 
@@ -26,6 +24,7 @@
 }  // namespace webkit
 
 namespace content {
+class WebGraphicsContext3DCommandBufferImpl;
 
 // A RenderWidget that hosts a fullscreen pepper plugin. This provides a
 // FullscreenContainer that the plugin instance can callback into to e.g.