Start untangling the avatar switcher from BrowserNonClientFrameView

chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.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_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_MUS_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_MUS_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
 #include "chrome/browser/ui/views/tab_icon_view_model.h"
 #include "chrome/browser/ui/views/tabs/tab_strip_observer.h"
-#include "ui/views/controls/button/button.h"
 
 class TabIconView;
 class WebAppLeftHeaderView;
 
 namespace mus {
 class Window;
 }
 
 namespace views {
 class ImageButton;
 class ToggleImageButton;
 }
 
 class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
                                      public TabIconViewModel,
-                                     public views::ButtonListener,
                                      public TabStripObserver {
  public:
   static const char kViewClassName[];
 
   BrowserNonClientFrameViewMus(BrowserFrame* frame, BrowserView* browser_view);
   ~BrowserNonClientFrameViewMus() override;
 
   void Init();
 
   // BrowserNonClientFrameView:
@@ skipping 21 matching lines @@
   void Layout() override;
   const char* GetClassName() const override;
   void GetAccessibleState(ui::AXViewState* state) override;
   gfx::Size GetMinimumSize() const override;
   void ChildPreferredSizeChanged(views::View* child) override;
 
   // TabIconViewModel:
   bool ShouldTabIconViewAnimate() const override;
   gfx::ImageSkia GetFaviconForTabIconView() override;
 
-  // views::ButtonListener:
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
  protected:
   // BrowserNonClientFrameView:
   void UpdateNewAvatarButtonImpl() override;
 
  private:
   mus::Window* mus_window();
 
   // Resets the client area on the mus::Window.
   void UpdateClientArea();
 
@@ skipping 53 matching lines @@
 
   // For popups, the window icon.
   TabIconView* window_icon_;
 
   TabStrip* tab_strip_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserNonClientFrameViewMus);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_MUS_H_