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

chrome/browser/ui/cocoa/tabs/tab_strip_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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
+#import "chrome/browser/ui/cocoa/has_weak_browser_pointer.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/url_drop_target.h"
 #include "chrome/browser/ui/tabs/hover_tab_selector.h"
 
 @class CrTrackingArea;
 @class NewTabButton;
 @class TabContentsController;
 @class TabView;
 @class TabStripDragController;
 @class TabStripView;
@@ skipping 25 matching lines @@
 
 @end
 
 // A class that handles managing the tab strip in a browser window. It uses
 // a supporting C++ bridge object to register for notifications from the
 // TabStripModel. The Obj-C part of this class handles drag and drop and all
 // the other Cocoa-y aspects.
 //
 // For a full description of the design, see
 // http://www.chromium.org/developers/design-documents/tab-strip-mac
-@interface TabStripController :
-  NSObject<TabControllerTarget,
-           URLDropTargetController> {
+@interface TabStripController : NSObject<TabControllerTarget,
+                                         URLDropTargetController,
+                                         HasWeakBrowserPointer> {
  @private
   base::scoped_nsobject<TabStripView> tabStripView_;
   NSView* switchView_;  // weak
   base::scoped_nsobject<NSView> dragBlockingView_;  // avoid bad window server
                                                     // drags
   NewTabButton* newTabButton_;  // weak, obtained from the nib.
 
   // The controller that manages all the interactions of dragging tabs.
   base::scoped_nsobject<TabStripDragController> dragController_;
 
@@ skipping 195 matching lines @@
 - (void)removeCustomWindowControls;
 
 @end
 
 @interface TabStripController(TestingAPI)
 - (void)setTabTitle:(TabController*)tab
        withContents:(content::WebContents*)contents;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_