The Apps ntp page should not display an avatar menu when clicking on the username.

chrome/browser/ui/cocoa/browser_window_cocoa.h

 // Copyright (c) 2012 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_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
@@ skipping 129 matching lines @@
   void HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) override;
   void Cut() override;
   void Copy() override;
   void Paste() override;
   WindowOpenDisposition GetDispositionForPopupBounds(
       const gfx::Rect& bounds) override;
   FindBar* CreateFindBar() override;
   web_modal::WebContentsModalDialogHost* GetWebContentsModalDialogHost()
       override;
-  void ShowAvatarBubble(content::WebContents* web_contents,
-                        const gfx::Rect& rect) override;
   void ShowAvatarBubbleFromAvatarButton(
       AvatarBubbleMode mode,
       const signin::ManageAccountsParams& manage_accounts_params) override;
   int GetRenderViewHeightInsetWithDetachedBookmarkBar() override;
   void ExecuteExtensionCommand(const extensions::Extension* extension,
                                const extensions::Command& command) override;
 
   // Overridden from ExtensionKeybindingRegistry::Delegate:
   extensions::ActiveTabPermissionGranter* GetActiveTabPermissionGranter()
       override;
@@ skipping 15 matching lines @@
   NSWindow* window() const;  // Accessor for the (current) |NSWindow|.
 
   Browser* browser_;  // weak, owned by controller
   BrowserWindowController* controller_;  // weak, owns us
   base::scoped_nsobject<NSString> pending_window_title_;
   ui::WindowShowState initial_show_state_;
   NSInteger attention_request_id_;  // identifier from requestUserAttention
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_