Move a bunch of code in content\renderer to the content namespace.

content/renderer/gpu/compositor_thread.h

Index: content/renderer/gpu/compositor_thread.h
===================================================================
--- content/renderer/gpu/compositor_thread.h	(revision 163045)
+++ content/renderer/gpu/compositor_thread.h	(working copy)
@@ -19,6 +19,8 @@
 
 class InputEventFilter;
 
+namespace content {
+
 // The CompositorThread class manages the background thread for the compositor.
 // The CompositorThread instance can be assumed to outlive the background
 // thread it manages.
@@ -68,4 +70,6 @@
   scoped_refptr<InputEventFilter> filter_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_