cleanup: Use EventRouter instead of ExtensionSystem::Get->event_router()

chrome/browser/extensions/api/extension_action/extension_action_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/extension_action/extension_action_api.h"
 
 #include "base/base64.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 332 matching lines @@
   }
   ExtensionActionExecuted(context, page_action, web_contents);
 }
 
 // static
 void ExtensionActionAPI::DispatchEventToExtension(
     content::BrowserContext* context,
     const std::string& extension_id,
     const std::string& event_name,
     scoped_ptr<base::ListValue> event_args) {
-  if (!extensions::ExtensionSystem::Get(context)->event_router())
+  if (!extensions::EventRouter::Get(context))
     return;
 
   scoped_ptr<Event> event(new Event(event_name, event_args.Pass()));
   event->restrict_to_browser_context = context;
   event->user_gesture = EventRouter::USER_GESTURE_ENABLED;
-  ExtensionSystem::Get(context)->event_router()->DispatchEventToExtension(
-      extension_id, event.Pass());
+  EventRouter::Get(context)
+      ->DispatchEventToExtension(extension_id, event.Pass());
 }
 
 // static
 void ExtensionActionAPI::DispatchOldPageActionEvent(
     content::BrowserContext* context,
     const std::string& extension_id,
     const std::string& page_action_id,
     int tab_id,
     const std::string& url,
     int button) {
@@ skipping 549 matching lines @@
   return true;
 }
 
 bool EnablePageActionsFunction::RunImpl() {
   return SetPageActionEnabled(true);
 }
 
 bool DisablePageActionsFunction::RunImpl() {
   return SetPageActionEnabled(false);
 }