Move the remaning files in content\common to the content namespace.

content/common/message_router.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/message_router.h"
 
 #include "ipc/ipc_message.h"
 
+namespace content {
+
 MessageRouter::MessageRouter() {
 }
 
 MessageRouter::~MessageRouter() {
 }
 
 bool MessageRouter::OnControlMessageReceived(const IPC::Message& msg) {
   NOTREACHED() <<
       "should override in subclass if you care about control messages";
   return false;
@@ skipping 25 matching lines @@
   if (!listener)
     return false;
 
   listener->OnMessageReceived(msg);
   return true;
 }
 
 IPC::Listener* MessageRouter::ResolveRoute(int32 routing_id) {
   return routes_.Lookup(routing_id);
 }
+
+}  // namespace content