Removing chrome.pushMessaging API

chrome/browser/background/background_application_list_model.h

Index: chrome/browser/background/background_application_list_model.h
diff --git a/chrome/browser/background/background_application_list_model.h b/chrome/browser/background/background_application_list_model.h
index 14f7d8ff3475797bfc686f81960f2d872ce7d803..530eec83d7316daeba9ba1c7b0b6b88c76278fef 100644
--- a/chrome/browser/background/background_application_list_model.h
+++ b/chrome/browser/background/background_application_list_model.h
@@ -144,13 +144,6 @@ class BackgroundApplicationListModel : public content::NotificationObserver {
   // Refresh the list of background applications and generate notifications.
   void Update();
 
-  // Determines if the given extension has to be considered a "background app"
-  // due to its use of PushMessaging. Normally every extension that expectes
-  // push messages is classified as "background app", however there are some
-  // rare exceptions, so this function implements a whitelist.
-  static bool RequiresBackgroundModeForPushMessaging(
-      const extensions::Extension& extension);
-
   ApplicationMap applications_;
   extensions::ExtensionList extensions_;
   ObserverList<Observer, true> observers_;