Mac: Fix lifetime problem under BookmarkBarController stopPulsingBookmarkNode.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_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_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stdint.h>
 
@@ skipping 276 matching lines @@
   BOOL hasInsertionPos_;
 
   // The x point on the bar where the left edge of the new item will end
   // up if it is dropped.
   CGFloat insertionPos_;
 
   // Controller responsible for all bookmark context menus.
   base::scoped_nsobject<BookmarkContextMenuCocoaController>
       contextMenuController_;
 
-  // Weak pointer to the pulsed button for the currently pulsing node. We need
-  // to store this as it may not be possible to determine the pulsing button if
-  // the pulsing node is deleted. Nil if there is no pulsing node.
-  BookmarkButton* pulsingButton_;
+  // The pulsed button for the currently pulsing node. We need to store this as
+  // it may not be possible to determine the pulsing button if the pulsing node
+  // is deleted. Nil if there is no pulsing node.
+  base::scoped_nsobject<BookmarkButton> pulsingButton_;
 
   // Specifically watch the currently pulsing node. This lets us stop pulsing
   // when anything happens to the node. Null if there is no pulsing node.
   std::unique_ptr<BookmarkModelObserverForCocoa> pulsingBookmarkObserver_;
 }
 
 @property(readonly, nonatomic) BookmarkBar::State currentState;
 @property(readonly, nonatomic) BookmarkBar::State lastState;
 @property(readonly, nonatomic) BOOL isAnimationRunning;
 @property(assign, nonatomic) id<BookmarkBarControllerDelegate> delegate;
@@ skipping 147 matching lines @@
 - (BookmarkButton*)buttonForDroppingOnAtPoint:(NSPoint)point;
 - (BOOL)isEventAnExitEvent:(NSEvent*)event;
 - (BOOL)shrinkOrHideView:(NSView*)view forMaxX:(CGFloat)maxViewX;
 - (void)unhighlightBookmark:(const bookmarks::BookmarkNode*)node;
 
 // The following are for testing purposes only and are not used internally.
 - (NSMenu *)menuForFolderNode:(const bookmarks::BookmarkNode*)node;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_BAR_CONTROLLER_H_