Improve the look of the avatar label button (views).

chrome/browser/ui/views/avatar_label.h

 // Copyright 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_VIEWS_AVATAR_LABEL_H_
 #define CHROME_BROWSER_UI_VIEWS_AVATAR_LABEL_H_
 
 #include "base/compiler_specific.h"
 #include "ui/views/controls/button/text_button.h"
 
 class BrowserView;
 
 namespace ui {
 class MouseEvent;
 class ThemeProvider;
-class NativeTheme;
 }
 
 // AvatarLabel
 //
 // A label used to display a string indicating that the current profile belongs
 // to a managed user.
 class AvatarLabel : public views::TextButton {
  public:
   AvatarLabel(BrowserView* browser_view, ui::ThemeProvider* theme_provider);
   virtual ~AvatarLabel();
 
   // views::TextButton:
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
-  virtual void GetExtraParams(
-      ui::NativeTheme::ExtraParams* params) const OVERRIDE;
 
   // Update the style of the label according to the provided theme.
   void UpdateLabelStyle();
 
  private:
   BrowserView* browser_view_;
   ui::ThemeProvider* theme_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(AvatarLabel);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AVATAR_LABEL_H_