[Mac] Inform reference counted objects that hold a weak Browser* when the Browser is being destroye…

chrome/browser/ui/cocoa/download/download_shelf_controller.h

 // Copyright (c) 2012 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>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/view_resizer.h"
 #include "ui/base/cocoa/tracking_area.h"
@@ skipping 68 matching lines @@
   // Delegate that handles resizing our view.
   id<ViewResizer> resizeDelegate_;
 
   // Used for loading pages.
   content::PageNavigator* navigator_;
 };
 
 - (id)initWithBrowser:(Browser*)browser
        resizeDelegate:(id<ViewResizer>)resizeDelegate;
 
+// Called by BrowserWindowController when the Browser is being destroyed.
+- (void)browserWillBeDestroyed;
+
 // Run when the user clicks the 'Show All' button.
 - (IBAction)showDownloadsTab:(id)sender;
 
 // Run when the user clicks the close button on the right side of the shelf.
 - (IBAction)handleClose:(id)sender;
 
 // Shows or hides the download shelf based on the value of |show|.
 // |isUserAction| should be YES if the operation is being triggered based on a
 // user action (currently only relevant when hiding the shelf).
 // Note: This is intended to be invoked from DownloadShelfMac. If invoked
@@ skipping 25 matching lines @@
 // release the downloads.
 - (void)exiting;
 
 // Return the height of the download shelf.
 - (float)height;
 
 // Re-layouts all download items based on their current state.
 - (void)layoutItems;
 
 @end