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

content/common/socket_stream_dispatcher.h

Index: content/common/socket_stream_dispatcher.h
===================================================================
--- content/common/socket_stream_dispatcher.h	(revision 163290)
+++ content/common/socket_stream_dispatcher.h	(working copy)
@@ -20,6 +20,8 @@
 class WebSocketStreamHandleDelegate;
 }
 
+namespace content {
+
 // Dispatches socket stream related messages sent to a child process from the
 // main browser process.  There is one instance per child process.  Messages
 // are dispatched on the main child thread.  The RenderThread class
@@ -45,4 +47,6 @@
   DISALLOW_COPY_AND_ASSIGN(SocketStreamDispatcher);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_SOCKET_STREAM_DISPATCHER_H_