wstring: make net::GetSuggestedFilename return utf-16

ui/base/dragdrop/os_exchange_data_provider_win.cc

 // 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.
 
 #include "ui/base/dragdrop/os_exchange_data_provider_win.h"
 
 #include "base/file_path.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/logging.h"
 #include "base/pickle.h"
@@ skipping 826 matching lines @@
   static const std::string kInternetShortcutFileEnd =
       "\r\n";
   *data = kInternetShortcutFileStart + url.spec() + kInternetShortcutFileEnd;
 }
 
 static void CreateValidFileNameFromTitle(const GURL& url,
                                          const std::wstring& title,
                                          std::wstring* validated) {
   if (title.empty()) {
     if (url.is_valid()) {
-      *validated = net::GetSuggestedFilename(
-          url, std::string(), std::string(), FilePath()).ToWStringHack();
+      *validated = UTF16ToWide(
+          net::GetSuggestedFilename(url, "", "", string16()));
     } else {
       // Nothing else can be done, just use a default.
       *validated =
           l10n_util::GetStringUTF16(IDS_APP_UNTITLED_SHORTCUT_FILE_NAME);
     }
   } else {
     *validated = title;
     file_util::ReplaceIllegalCharactersInPath(validated, '-');
   }
   static const wchar_t extension[] = L".url";
@@ skipping 57 matching lines @@
   return new OSExchangeDataProviderWin();
 }
 
 // static
 OSExchangeData::CustomFormat OSExchangeData::RegisterCustomFormat(
     const std::string& type) {
   return RegisterClipboardFormat(ASCIIToWide(type).c_str());
 }
 
 }  // namespace ui