Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/ui/media_utils.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/ui/media_utils.h"
 
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
+#include "chrome/browser/profiles/profile.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/constants.h"
 
 class Profile;
 
 namespace content {
 class WebContents;
 }
 
 void RequestMediaAccessPermission(
     content::WebContents* web_contents,
     Profile* profile,
     const content::MediaStreamRequest& request,
     const content::MediaResponseCallback& callback) {
   const extensions::Extension* extension = NULL;
   GURL origin(request.security_origin);
   if (origin.SchemeIs(extensions::kExtensionScheme)) {
     ExtensionService* extensions_service =
         extensions::ExtensionSystem::Get(profile)->extension_service();
     extension = extensions_service->extensions()->GetByID(origin.host());
     DCHECK(extension);
   }
 
   MediaCaptureDevicesDispatcher::GetInstance()->ProcessMediaAccessRequest(
       web_contents, request, callback, extension);
 }