[Extensions Mac] Implement developer mode warning on mac

chrome/browser/ui/cocoa/extensions/extension_toolbar_icon_surfacing_bubble_mac.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_TOOLBAR_ICON_SURFACING_BUBBLE_MAC_H_
-#define CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_TOOLBAR_ICON_SURFACING_BUBBLE_MAC_H_
-
-#import <Cocoa/Cocoa.h>
-
-#import "chrome/browser/ui/cocoa/base_bubble_controller.h"
-
-class ToolbarActionsBarBubbleDelegate;
-
-// A bubble for a short user education for the new extension toolbar.
-@interface ExtensionToolbarIconSurfacingBubbleMac : BaseBubbleController {
-  // Whether or not the bubble has been acknowledged.
-  BOOL acknowledged_;
-
-  ToolbarActionsBarBubbleDelegate* delegate_;
-}
-
-// Creates the bubble for a parent window but does not show it.
-- (id)initWithParentWindow:(NSWindow*)parentWindow
-               anchorPoint:(NSPoint)anchorPoint
-                  delegate:(ToolbarActionsBarBubbleDelegate*)delegate;
-
-@end
-
-#endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_TOOLBAR_ICON_SURFACING_BUBBLE_MAC_H_