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

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

Index: chrome/browser/ui/cocoa/toolbar/app_toolbar_button_cell.h
diff --git a/chrome/browser/ui/cocoa/toolbar/app_toolbar_button_cell.h b/chrome/browser/ui/cocoa/toolbar/app_toolbar_button_cell.h
index cf3273e9212e9b36f61d4c042274437cc29624e4..b8ffa69fdb2334136657f44a22395924f9347c10 100644
--- a/chrome/browser/ui/cocoa/toolbar/app_toolbar_button_cell.h
+++ b/chrome/browser/ui/cocoa/toolbar/app_toolbar_button_cell.h
@@ -10,21 +10,13 @@
 #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_