Remove deprecated gfx::Image::operator NSImage*().

chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.mm

 // 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.
 
 #include "chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <cmath>
 
@@ skipping 335 matching lines @@
                                 kCrWebURLsWithTitlesPboardType,
                                 NSURLPboardType,
                                 nil];
   return [pb availableTypeFromArray:availableTypes] != nil;
 }
 
 NSImage* DragImageForBookmark(NSImage* favicon, const string16& title) {
   // If no favicon, use a default.
   if (!favicon) {
     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
-    favicon = rb.GetNativeImageNamed(IDR_DEFAULT_FAVICON);
+    favicon = rb.GetNativeImageNamed(IDR_DEFAULT_FAVICON).ToNSImage();
   }
 
   // If no title, just use icon.
   if (title.empty())
     return favicon;
   NSString* ns_title = base::SysUTF16ToNSString(title);
 
   // Set the look of the title.
   NSDictionary* attrs =
       [NSDictionary dictionaryWithObject:[NSFont systemFontOfSize:
@@ skipping 64 matching lines @@
   [window dragImage:drag_image
                  at:position
              offset:NSZeroSize
               event:drag_event
          pasteboard:[NSPasteboard pasteboardWithName:NSDragPboard]
              source:nil
           slideBack:YES];
 }
 
 }  // namespace bookmark_pasteboard_helper_mac