Tab audio indicator tweaks

chrome/browser/ui/cocoa/tabs/tab_audio_indicator_view_mac.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_TABS_TAB_AUDIO_INDICATOR_VIEW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_AUDIO_INDICATOR_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace content {
 class WebContents;
 }
 class TabAudioIndicator;
 class TabAudioIndicatorDelegateMac;
 
 // A view that draws an audio indicator on top of a favicon.
 @interface TabAudioIndicatorViewMac : NSView {
  @private
   scoped_ptr<TabAudioIndicator> tabAudioIndicator_;
   scoped_ptr<TabAudioIndicatorDelegateMac> delegate_;
-  scoped_nsobject<NSImage> backgroundImage_;
 }
 
 - (void)setIsPlayingAudio:(BOOL)isPlayingAudio;
 
 - (void)setBackgroundImage:(NSImage*)backgroundImage;
 
 - (BOOL)isAnimating;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_AUDIO_INDICATOR_VIEW_MAC_H_