Move a bunch of content\common code into the content namespace.

content/common/socket_stream_handle_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_RENDERER_SOCKET_STREAM_HANDLE_DATA_H_
 #define CONTENT_RENDERER_SOCKET_STREAM_HANDLE_DATA_H_
 
 #include "base/supports_user_data.h"
 #include "content_export.h"
 
 namespace WebKit {
 class WebSocketStreamHandle;
 }
 
+namespace content {
+
 // User data stored in each WebSocketStreamHandleImpl.
 class SocketStreamHandleData : public base::SupportsUserData::Data {
  public:
   virtual ~SocketStreamHandleData() {}
 
   int render_view_id() const { return render_view_id_; }
 
   // Creates SocketStreamHandleData object with |render_view_id| and store it
   // to |handle|.
   static void AddToHandle(
       WebKit::WebSocketStreamHandle* handle, int render_view_id);
 
   // Retrieves the stored user data from WebKit::WebSocketStreamHandle object.
   // |handle| must actually be a WebSocketStreamHandleImpl object.
   CONTENT_EXPORT static const SocketStreamHandleData* ForHandle(
       WebKit::WebSocketStreamHandle* handle);
 
  private:
   explicit SocketStreamHandleData(int render_view_id)
       : render_view_id_(render_view_id) {
   }
 
   int render_view_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SocketStreamHandleData);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_SOCKET_STREAM_HANDLE_DATA_H_