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

content/renderer/media/mock_media_stream_dispatcher.h

Index: content/renderer/media/mock_media_stream_dispatcher.h
===================================================================
--- content/renderer/media/mock_media_stream_dispatcher.h	(revision 163007)
+++ content/renderer/media/mock_media_stream_dispatcher.h	(working copy)
@@ -10,6 +10,8 @@
 #include "content/renderer/media/media_stream_dispatcher.h"
 #include "googleurl/src/gurl.h"
 
+namespace content {
+
 // This class is a mock implementation of MediaStreamDispatcher.
 class MockMediaStreamDispatcher : public MediaStreamDispatcher {
  public:
@@ -48,4 +50,6 @@
   DISALLOW_COPY_AND_ASSIGN(MockMediaStreamDispatcher);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_MEDIA_MOCK_MEDIA_STREAM_DISPATCHER_H_