Revert of [Extensions] Make extension message bubble factory platform-abstract

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
index 19f9ac8aea7d2423ded80b52a3906d777e4384cc..dc640a18c3ed719ee9875e8defca806e81fa2b57 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
@@ -171,9 +171,6 @@
   bool IsPopupRunning() const override;
   void OnOverflowedActionWantsToRunChanged(bool overflowed_action_wants_to_run)
       override;
-  void ShowExtensionMessageBubble(
-      scoped_ptr<extensions::ExtensionMessageBubbleController> controller)
-          override;
 
   // The owning BrowserActionsController; weak.
   BrowserActionsController* controller_;
@@ -249,11 +246,6 @@
     bool overflowed_action_wants_to_run) {
   [[controller_ toolbarController]
       setOverflowedToolbarActionWantsToRun:overflowed_action_wants_to_run];
-}
-
-void ToolbarActionsBarBridge::ShowExtensionMessageBubble(
-    scoped_ptr<extensions::ExtensionMessageBubbleController> controller) {
-  NOTREACHED();  // Not yet implemented on Mac.
 }
 
 }  // namespace