Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/apps/ephemeral_app_throttle.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/apps/ephemeral_app_throttle.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/apps/ephemeral_app_launcher.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "components/navigation_interception/intercept_navigation_resource_throttle.h"
 #include "components/navigation_interception/navigation_params.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_throttle.h"
 #include "content/public/browser/web_contents.h"
+#include "extensions/browser/extension_system.h"
 #include "net/url_request/url_request.h"
 
 using content::BrowserThread;
 using content::WebContents;
 using extensions::Extension;
 
 namespace {
 
 bool LaunchEphemeralApp(
     const std::string& app_id,
@@ skipping 60 matching lines @@
     return NULL;
 
   std::string app_id(request->url().ExtractFileName());
   if (!Extension::IdIsValid(app_id))
     return NULL;
 
   return new navigation_interception::InterceptNavigationResourceThrottle(
       request,
       base::Bind(&LaunchEphemeralApp, app_id));
 }