Remove fields that are unused and reference classes that do not exist.

chrome/browser/cocoa/throbber_view.h

 // Copyright (c) 2009 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_COCOA_THROBBER_VIEW_H_
 #define CHROME_BROWSER_COCOA_THROBBER_VIEW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
 
-@class ThrobberTimerTarget;
 @protocol ThrobberDataDelegate;
 
 // A class that knows how to draw an animated state to indicate progress.
 // Creating the class starts the animation, destroying it stops it. There are
 // two types:
 //
 // - Filmstrip: Draws via a sequence of frames in an image. There is no state
 //   where the class is frozen on an image and not animating. The image needs to
 //   be made of squares such that the height divides evenly into the width.
 //
 // - Toast: Draws an image animating down to the bottom and then another image
 //   animating up from the bottom. Stops once the animation is complete.
 
 @interface ThrobberView : NSView {
  @private
-  scoped_nsobject<ThrobberTimerTarget> target_;  // Target of animation timer.
   id<ThrobberDataDelegate> dataDelegate_;
   NSTimer* timer_;  // Animation timer. Weak, owned by runloop.
 }
 
 // Creates a filmstrip view with |frame| and image |image|.
 + (id)filmstripThrobberViewWithFrame:(NSRect)frame
                                image:(NSImage*)image;
 
 // Creates a toast view with |frame| and specified images.
 + (id)toastThrobberViewWithFrame:(NSRect)frame
                      beforeImage:(NSImage*)beforeImage
                       afterImage:(NSImage*)afterImage;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_THROBBER_VIEW_H_