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

chrome/browser/extensions/api/history/history_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/history/history_api.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 12 matching lines @@
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/api/history.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "extensions/browser/event_router.h"
-#include "extensions/browser/extension_system.h"
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 namespace extensions {
 
 using api::history::HistoryItem;
 using api::history::VisitItem;
 using extensions::ActivityLog;
 
 typedef std::vector<linked_ptr<api::history::HistoryItem> >
@@ skipping 142 matching lines @@
   removed.urls.reset(urls);
 
   scoped_ptr<base::ListValue> args = OnVisitRemoved::Create(removed);
   DispatchEvent(profile, api::history::OnVisitRemoved::kEventName, args.Pass());
 }
 
 void HistoryEventRouter::DispatchEvent(
     Profile* profile,
     const std::string& event_name,
     scoped_ptr<base::ListValue> event_args) {
-  if (profile && extensions::ExtensionSystem::Get(profile)->event_router()) {
+  if (profile && extensions::EventRouter::Get(profile)) {
     scoped_ptr<extensions::Event> event(new extensions::Event(
         event_name, event_args.Pass()));
     event->restrict_to_browser_context = profile;
-    extensions::ExtensionSystem::Get(profile)->event_router()->
-        BroadcastEvent(event.Pass());
+    extensions::EventRouter::Get(profile)->BroadcastEvent(event.Pass());
   }
 }
 
 HistoryAPI::HistoryAPI(content::BrowserContext* context)
     : browser_context_(context) {
-  ExtensionSystem::Get(browser_context_)->event_router()->RegisterObserver(
-      this, api::history::OnVisited::kEventName);
-  ExtensionSystem::Get(browser_context_)->event_router()->RegisterObserver(
-      this, api::history::OnVisitRemoved::kEventName);
+  EventRouter* event_router = EventRouter::Get(browser_context_);
+  event_router->RegisterObserver(this, api::history::OnVisited::kEventName);
+  event_router->RegisterObserver(this,
+                                 api::history::OnVisitRemoved::kEventName);
 }
 
 HistoryAPI::~HistoryAPI() {
 }
 
 void HistoryAPI::Shutdown() {
-  ExtensionSystem::Get(browser_context_)->event_router()->UnregisterObserver(
-      this);
+  EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 static base::LazyInstance<BrowserContextKeyedAPIFactory<HistoryAPI> >
     g_factory = LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<HistoryAPI>* HistoryAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 template <>
 void BrowserContextKeyedAPIFactory<HistoryAPI>::DeclareFactoryDependencies() {
   DependsOn(ActivityLog::GetFactoryInstance());
   DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
 }
 
 void HistoryAPI::OnListenerAdded(const EventListenerInfo& details) {
   history_event_router_.reset(
       new HistoryEventRouter(Profile::FromBrowserContext(browser_context_)));
-  ExtensionSystem::Get(browser_context_)->event_router()->UnregisterObserver(
-      this);
+  EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 void HistoryFunction::Run() {
   if (!RunImpl()) {
     SendResponse(false);
   }
 }
 
 bool HistoryFunction::ValidateUrl(const std::string& url_string, GURL* url) {
   GURL temp_url(url_string);
@@ skipping 235 matching lines @@
   }
 
   return true;
 }
 
 void HistoryDeleteAllFunction::DeleteComplete() {
   SendAsyncResponse();
 }
 
 }  // namespace extensions