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

chrome/browser/extensions/menu_manager.cc

Index: chrome/browser/extensions/menu_manager.cc
diff --git a/chrome/browser/extensions/menu_manager.cc b/chrome/browser/extensions/menu_manager.cc
index 6002ef3b3741e71d88ae7f3be2b1887b4e6288ad..a5d7923b8337731aa4d3ec2a356478673c3f92dd 100644
--- a/chrome/browser/extensions/menu_manager.cc
+++ b/chrome/browser/extensions/menu_manager.cc
@@ -607,8 +607,7 @@ void MenuManager::ExecuteCommand(Profile* profile,
                                  WebContents* web_contents,
                                  const content::ContextMenuParams& params,
                                  const MenuItem::Id& menu_item_id) {
-  EventRouter* event_router = extensions::ExtensionSystem::Get(profile)->
-      event_router();
+  EventRouter* event_router = EventRouter::Get(profile);
   if (!event_router)
     return;