ui/base/dragdrop: Use base::string16 now that string16 was moved into base namespace.

ui/base/dragdrop/cocoa_dnd_util.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 UI_BASE_DRAGDROP_MAC_DND_UTIL_H_
 #define UI_BASE_DRAGDROP_MAC_DND_UTIL_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <vector>
@@ skipping 17 matching lines @@
 // put it on as this Chrome-only flavor. External apps won't see HTML but
 // Chrome will know enough to read it as HTML. <http://crbug.com/55879>
 UI_EXPORT extern NSString* const kChromeDragImageHTMLPboardType;
 
 // Populates the |url| and |title| with URL data in |pboard|. There may be more
 // than one, but we only handle dropping the first. |url| must not be |NULL|;
 // |title| is an optional parameter. Returns |YES| if URL data was obtained from
 // the pasteboard, |NO| otherwise. If |convert_filenames| is |YES|, the function
 // will also attempt to convert filenames in |pboard| to file URLs.
 UI_EXPORT BOOL PopulateURLAndTitleFromPasteboard(GURL* url,
-                                                 string16* title,
+                                                 base::string16* title,
                                                  NSPasteboard* pboard,
                                                  BOOL convert_filenames);
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_MAC_DND_UTIL_H_