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

content/common/net/url_request_user_data.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_COMMON_NET_URL_REQUEST_USER_DATA_H_
 #define CONTENT_COMMON_NET_URL_REQUEST_USER_DATA_H_
 
 #include "base/supports_user_data.h"
 
+namespace content {
+
 // Used to annotate all URLRequests for which the request can be associated
 // with a given render view.
 class URLRequestUserData : public base::SupportsUserData::Data {
  public:
   URLRequestUserData(int render_process_id, int render_view_id);
   virtual ~URLRequestUserData();
 
   int render_process_id() const { return render_process_id_; }
   int render_view_id() const { return render_view_id_; }
 
   static const void* kUserDataKey;
 
  private:
   int render_process_id_;
   int render_view_id_;
 };
 
+}  // namespace content
+
 #endif  // CONTENT_COMMON_NET_URL_REQUEST_USER_DATA_H_