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

chrome/browser/extensions/api/management/management_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/management/management_api.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 696 matching lines @@
   scoped_ptr<base::ListValue> args(new base::ListValue());
   if (event_name == management::OnUninstalled::kEventName) {
     args->Append(new base::StringValue(extension->id()));
   } else {
     scoped_ptr<management::ExtensionInfo> info = CreateExtensionInfo(
         *extension, ExtensionSystem::Get(profile));
     args->Append(info->ToValue().release());
   }
 
   scoped_ptr<Event> event(new Event(event_name, args.Pass()));
-  ExtensionSystem::Get(profile)->event_router()->BroadcastEvent(event.Pass());
+  EventRouter::Get(profile)->BroadcastEvent(event.Pass());
 }
 
 ManagementAPI::ManagementAPI(content::BrowserContext* context)
     : browser_context_(context) {
-  EventRouter* event_router =
-      ExtensionSystem::Get(browser_context_)->event_router();
+  EventRouter* event_router = EventRouter::Get(browser_context_);
   event_router->RegisterObserver(this, management::OnInstalled::kEventName);
   event_router->RegisterObserver(this, management::OnUninstalled::kEventName);
   event_router->RegisterObserver(this, management::OnEnabled::kEventName);
   event_router->RegisterObserver(this, management::OnDisabled::kEventName);
 }
 
 ManagementAPI::~ManagementAPI() {
 }
 
 void ManagementAPI::Shutdown() {
-  ExtensionSystem::Get(browser_context_)->event_router()->UnregisterObserver(
-      this);
+  EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 static base::LazyInstance<BrowserContextKeyedAPIFactory<ManagementAPI> >
     g_factory = LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<ManagementAPI>*
 ManagementAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 void ManagementAPI::OnListenerAdded(const EventListenerInfo& details) {
   management_event_router_.reset(
       new ManagementEventRouter(Profile::FromBrowserContext(browser_context_)));
-  ExtensionSystem::Get(browser_context_)->event_router()->UnregisterObserver(
-      this);
+  EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions