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

chrome/browser/ui/cocoa/find_bar/find_bar_cocoa_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>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
+#import "chrome/browser/ui/cocoa/has_weak_browser_pointer.h"
 #include "ui/gfx/geometry/point.h"
 
 class Browser;
 class FindBarBridge;
 @class FindBarTextField;
 class FindNotificationDetails;
 @class FocusTracker;
 
 // A controller for the find bar in the browser window.  Manages
 // updating the state of the find bar and provides a target for the
 // next/previous/close buttons.  Certain operations require a pointer
 // to the cross-platform FindBarController, so be sure to call
 // setFindBarBridge: after creating this controller.
 
-@interface FindBarCocoaController : NSViewController {
+@interface FindBarCocoaController : NSViewController<HasWeakBrowserPointer> {
  @private
   IBOutlet NSView* findBarView_;
   IBOutlet FindBarTextField* findText_;
   IBOutlet NSButton* nextButton_;
   IBOutlet NSButton* previousButton_;
   IBOutlet NSButton* closeButton_;
 
   // Needed to call methods on FindBarController.
   FindBarBridge* findBarBridge_;  // weak
 
@@ skipping 62 matching lines @@
 - (BOOL)isFindBarAnimating;
 
 // Returns the FindBar's position in the superview's coordinates, but with
 // the Y coordinate growing down.
 - (gfx::Point)findBarWindowPosition;
 
 // Returns the width of the FindBar.
 - (int)findBarWidth;
 
 @end