Remove ExtensionMessageService's legacy support for devtools.

chrome/browser/extensions/extension_devtools_bridge.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_DEVTOOLS_BRIDGE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DEVTOOLS_BRIDGE_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/extension_devtools_manager.h"
-#include "chrome/browser/extensions/extension_message_service.h"
 #include "content/public/browser/devtools_client_host.h"
 
 class Profile;
 
 // This class is a DevToolsClientHost that fires extension events.
 class ExtensionDevToolsBridge : public content::DevToolsClientHost {
  public:
   ExtensionDevToolsBridge(int tab_id, Profile* profile);
   virtual ~ExtensionDevToolsBridge();
 
@@ skipping 22 matching lines @@
 
   // The names of the events fired at extensions depend on the tab id,
   // so we store the various event names in each bridge.
   const std::string on_page_event_name_;
   const std::string on_tab_close_event_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDevToolsBridge);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DEVTOOLS_BRIDGE_H_