Remove a bunch of pre-MD toolbar code and assets.

chrome/browser/ui/cocoa/toolbar/app_toolbar_button_cell.h

 // Copyright (c) 2013 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_TOOLBAR_APP_TOOLBAR_BUTTON_CELL_H_
 #define CHROME_BROWSER_UI_COCOA_TOOLBAR_APP_TOOLBAR_BUTTON_CELL_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 
 #import "chrome/browser/ui/cocoa/clickhold_button_cell.h"
-#include "chrome/browser/ui/toolbar/app_menu_icon_painter.h"
 
-class AppMenuIconPainterDelegateMac;
 
 // Cell for the app toolbar button. This is used to draw the app menu icon
 // and paint severity levels.
 @interface AppToolbarButtonCell : ClickHoldButtonCell {
- @private
-  std::unique_ptr<AppMenuIconPainter> iconPainter_;
-  std::unique_ptr<AppMenuIconPainterDelegateMac> delegate_;
 }
 
-- (void)setSeverity:(AppMenuIconPainter::Severity)severity
-      shouldAnimate:(BOOL)shouldAnimate;
-
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_APP_TOOLBAR_BUTTON_CELL_H_