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

chrome/browser/extensions/api/notifications/notifications_api.cc

Index: chrome/browser/extensions/api/notifications/notifications_api.cc
diff --git a/chrome/browser/extensions/api/notifications/notifications_api.cc b/chrome/browser/extensions/api/notifications/notifications_api.cc
index 14bfc28a010b90f40fafd9d100bad70dd00fbbc2..472d88760e58c35290b5e42549c085c642f58d88 100644
--- a/chrome/browser/extensions/api/notifications/notifications_api.cc
+++ b/chrome/browser/extensions/api/notifications/notifications_api.cc
@@ -20,7 +20,6 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "extensions/browser/event_router.h"
-#include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/features/feature.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ -157,8 +156,8 @@ class NotificationsApiDelegate : public NotificationDelegate {
   }
 
   virtual bool HasClickedListener() OVERRIDE {
-    return ExtensionSystem::Get(profile_)->event_router()->HasEventListener(
-        notifications::OnClicked::kEventName);
+    return EventRouter::Get(profile_)
+        ->HasEventListener(notifications::OnClicked::kEventName);
   }
 
   virtual void ButtonClick(int index) OVERRIDE {
@@ -194,8 +193,8 @@ class NotificationsApiDelegate : public NotificationDelegate {
 
   void SendEvent(const std::string& name, scoped_ptr<base::ListValue> args) {
     scoped_ptr<Event> event(new Event(name, args.Pass()));
-    ExtensionSystem::Get(profile_)->event_router()->DispatchEventToExtension(
-        extension_id_, event.Pass());
+    EventRouter::Get(profile_)
+        ->DispatchEventToExtension(extension_id_, event.Pass());
   }
 
   scoped_ptr<base::ListValue> CreateBaseEventArgs() {