Use utf_string_conversions header in more places.

chrome/browser/password_manager/encryptor_win.cc

 // Copyright (c) 2006-2008 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/password_manager/encryptor.h"
 
 #include <windows.h>
 #include <wincrypt.h>
-#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 
 #pragma comment(lib, "crypt32.lib")
 
 bool Encryptor::EncryptString16(const string16& plaintext,
                                 std::string* ciphertext) {
   return EncryptString(UTF16ToUTF8(plaintext), ciphertext);
 }
 
 bool Encryptor::DecryptString16(const std::string& ciphertext,
                                 string16* plaintext) {
@@ skipping 36 matching lines @@
   DATA_BLOB output;
   BOOL result = CryptUnprotectData(&input, NULL, NULL, NULL, NULL,
                                    0, &output);
   if (!result)
     return false;
 
   plaintext->assign(reinterpret_cast<char*>(output.pbData), output.cbData);
   LocalFree(output.pbData);
   return true;
 }