Start untangling the avatar switcher from BrowserNonClientFrameView

chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h

Index: chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
diff --git a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
index 774a4b3cea11dc7bbd6e6ae4c17b34e6d3df1e52..723adb950ad4b8b6e7ed91591754c70238483888 100644
--- a/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
+++ b/chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h
@@ -10,7 +10,6 @@
 #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;
@@ -26,7 +25,6 @@ class ToggleImageButton;
 
 class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
                                      public TabIconViewModel,
-                                     public views::ButtonListener,
                                      public TabStripObserver {
  public:
   static const char kViewClassName[];
@@ -68,9 +66,6 @@ class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
   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;