Use a direct include of strings headers in ui/, part 1.

ui/base/clipboard/clipboard_util_win.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.
 //
 // Some helper functions for working with the clipboard and IDataObjects.
 
 #ifndef UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_
 
 #include <shlobj.h>
 #include <map>
 #include <string>
 #include <vector>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/base/ui_export.h"
 
 namespace ui {
 
 class UI_EXPORT ClipboardUtil {
  public:
   /////////////////////////////////////////////////////////////////////////////
   // These methods check to see if |data_object| has the requested type.
   // Returns true if it does.
   static bool HasUrl(IDataObject* data_object);
@@ skipping 35 matching lines @@
   static void CFHtmlExtractMetadata(const std::string& cf_html,
                                     std::string* base_url,
                                     size_t* html_start,
                                     size_t* fragment_start,
                                     size_t* fragment_end);
 };
 
 }
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_WIN_H_