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

chrome/browser/extensions/api/location/location_manager.cc

Index: chrome/browser/extensions/api/location/location_manager.cc
diff --git a/chrome/browser/extensions/api/location/location_manager.cc b/chrome/browser/extensions/api/location/location_manager.cc
index 35ed6346beb852909b6d190d2d03b004b72e7551..7a0798029dcdfdecadca1574982798abdf9a69c8 100644
--- a/chrome/browser/extensions/api/location/location_manager.cc
+++ b/chrome/browser/extensions/api/location/location_manager.cc
@@ -393,8 +393,8 @@ void LocationManager::SendLocationUpdate(
 
   scoped_ptr<Event> event(new Event(event_name, args.Pass()));
 
-  ExtensionSystem::Get(profile_)->event_router()->
-      DispatchEventToExtension(extension_id, event.Pass());
+  EventRouter::Get(profile_)
+      ->DispatchEventToExtension(extension_id, event.Pass());
 }
 
 void LocationManager::Observe(int type,