Fix up clang on mac.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_view.mm

 // 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 "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_view.h"
 
 #include "chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_folder_target.h"
 #include "content/browser/user_metrics.h"
 
 #import "third_party/mozilla/NSPasteboard+Utils.h"
 
+@interface BookmarkBarFolderView()
+
+@property(readonly, nonatomic) id<BookmarkButtonControllerProtocol> controller;
+
+@end
+
 @implementation BookmarkBarFolderView
 
-@synthesize dropIndicatorShown = dropIndicatorShown_;
-@synthesize dropIndicatorPosition = dropIndicatorPosition_;
-@synthesize controller = controller_;
-
 - (void)awakeFromNib {
   NSArray* types = [NSArray arrayWithObjects:
                     NSStringPboardType,
                     NSHTMLPboardType,
                     NSURLPboardType,
                     kBookmarkButtonDragType,
                     kBookmarkDictionaryListPboardType,
                     nil];
   [self registerForDraggedTypes:types];
 }
@@ skipping 165 matching lines @@
   NSPasteboard* pboard = [info draggingPasteboard];
   if ([pboard dataForType:kBookmarkButtonDragType] &&
       [self performDragOperationForBookmarkButton:info])
     return YES;
   if ([pboard containsURLData] && [self performDragOperationForURL:info])
     return YES;
   return NO;
 }
 
 @end