Enables hot-tracking for overflow extension buttons in the app menu

chrome/browser/ui/libgtk2ui/native_theme_gtk2.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_LIBGTK2UI_NATIVE_THEME_GTK2_H_
 #define CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_
 
 #include <gtk/gtk.h>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
   // Overridden from ui::NativeThemeBase:
   SkColor GetSystemColor(ColorId color_id) const override;
   void PaintMenuPopupBackground(
       SkCanvas* canvas,
       const gfx::Size& size,
       const MenuBackgroundExtraParams& menu_background) const override;
   void PaintMenuItemBackground(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
-      const MenuListExtraParams& menu_list) const override;
+      const MenuItemExtraParams& menu_item) const override;
 
   // Gets a ChromeGtkFrame theme color; returns true on success. Always returns
   // false in GTK3.
   bool GetChromeStyleColor(const char* style_property,
                            SkColor* ret_color) const;
 
   // Returns various widgets for theming use.
   GtkWidget* GetWindow() const;
   GtkWidget* GetEntry() const;
   GtkWidget* GetLabel() const;
   GtkWidget* GetButton() const;
   GtkWidget* GetBlueButton() const;
   GtkWidget* GetTree() const;
   GtkWidget* GetTooltip() const;
   GtkWidget* GetMenu() const;
   GtkWidget* GetMenuItem() const;
 
  private:
   NativeThemeGtk2();
   ~NativeThemeGtk2() override;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeGtk2);
 };
 
 }  // namespace libgtk2ui
 
 #endif  // CHROME_BROWSER_UI_LIBGTK2UI_NATIVE_THEME_GTK2_H_