Fix up clang on mac.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_view.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>
 
 @protocol BookmarkButtonControllerProtocol;
 @class BookmarkBarFolderController;
 
 // Main content view for a bookmark bar folder "menu" window.  This is
 // logically similar to a BookmarkBarView but is oriented vertically.
 @interface BookmarkBarFolderView : NSView {
  @private
   BOOL inDrag_;  // Are we in the middle of a drag?
   BOOL dropIndicatorShown_;
   CGFloat dropIndicatorPosition_;  // y position
   // The following |controller_| is weak; used for testing only. See the imple-
   // mentation comment for - (id<BookmarkButtonControllerProtocol>)controller.
   id<BookmarkButtonControllerProtocol> controller_;
 }
-@property(readonly, assign) id<BookmarkButtonControllerProtocol> controller;
 @end
-
-@interface BookmarkBarFolderView()  // TestingOrInternalAPI
-@property(assign) BOOL dropIndicatorShown;
-@property(readonly) CGFloat dropIndicatorPosition;
-@property(assign) id<BookmarkButtonControllerProtocol> controller;
-@end