Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/cast_channel/cast_channel_api.cc

 // Copyright 2013 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 "chrome/browser/extensions/api/cast_channel/cast_channel_api.h"
 
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/cast_channel/cast_socket.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/net/chrome_net_log.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
 #include "net/base/net_errors.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 namespace Close = cast_channel::Close;
 namespace OnError = cast_channel::OnError;
 namespace OnMessage = cast_channel::OnMessage;
 namespace Open = cast_channel::Open;
 namespace Send = cast_channel::Send;
@@ skipping 236 matching lines @@
     SetResultFromError(cast_channel::CHANNEL_ERROR_SOCKET_ERROR);
   } else {
     int channel_id = params_->channel.channel_id;
     SetResultFromSocket(channel_id);
     RemoveSocket(channel_id);
   }
   AsyncWorkCompleted();
 }
 
 }  // namespace extensions