Extract chrome.runtime API code from extensions::EventRouter

chrome/browser/speech/tts_extension_loader_chromeos.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 CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_
 #define CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_
 
 #include "chrome/browser/extensions/event_router.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 
+class Profile;
+
 // Profile-keyed class that loads a built-in TTS component extension
 // into a given profile on Chrome OS.
 class TtsExtensionLoaderChromeOs
     : public BrowserContextKeyedService,
       public extensions::EventRouter::Observer {
  public:
   static TtsExtensionLoaderChromeOs* GetInstance(Profile* profile);
 
   // Returns true if the extension was not previously loaded and is now
   // loading. This class will call
@@ skipping 21 matching lines @@
 
   Profile* profile_;
   TtsState tts_state_;
 
   friend class TtsExtensionLoaderChromeOsFactory;
 
   DISALLOW_COPY_AND_ASSIGN(TtsExtensionLoaderChromeOs);
 };
 
 #endif  // CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_