Make the shadow for the fullscreen exit bubble for mac more prominent.

chrome/browser/ui/cocoa/fullscreen_exit_bubble_controller.h

 // Copyright (c) 2011 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.
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
 #include "base/memory/scoped_nsobject.h"
 #include "chrome/browser/ui/fullscreen_exit_bubble_type.h"
 #include "googleurl/src/gurl.h"
 
 class TabContentsWrapper;
 @class BrowserWindowController;
 class Browser;
 @class GTMUILocalizerAndLayoutTweaker;
-@class InfoBubbleView;
 
 // The FullscreenExitBubbleController manages the bubble that tells the user
 // how to escape fullscreen mode. The bubble only appears when a tab requests
 // fullscreen mode via webkitRequestFullScreen().
 @interface FullscreenExitBubbleController :
     NSWindowController<NSTextViewDelegate, NSAnimationDelegate> {
  @private
   BrowserWindowController* owner_;  // weak
   Browser* browser_; // weak
   GURL url_;
   BOOL showButtons_;
   FullscreenExitBubbleType bubbleType_;
 
  @protected
   IBOutlet NSTextField* exitLabelPlaceholder_;
   IBOutlet NSTextField* messageLabel_;
   IBOutlet NSButton* allowButton_;
   IBOutlet NSButton* denyButton_;
-  IBOutlet InfoBubbleView* bubble_;
   IBOutlet GTMUILocalizerAndLayoutTweaker* tweaker_;
 
   // Text fields don't work as well with embedded links as text views, but
   // text views cannot conveniently be created in IB. The xib file contains
   // a text field |exitLabelPlaceholder_| that's replaced by this text view
   // |exitLabel_| in -awakeFromNib.
   scoped_nsobject<NSTextView> exitLabel_;
 
   scoped_nsobject<NSTimer> hideTimer_;
   scoped_nsobject<NSAnimation> hideAnimation_;
@@ skipping 12 matching lines @@
 - (void)closeImmediately;
 
 // Positions the fullscreen exit bubble in the top-center of the window.
 - (void)positionInWindowAtTop:(CGFloat)maxY width:(CGFloat)maxWidth;
 
 // Updates the bubble contents with |url| and |bubbleType|.
 - (void)updateURL:(const GURL&)url
        bubbleType:(FullscreenExitBubbleType)bubbleType;
 
 @end