Use a direct include of strings headers in x/.

chrome/browser/ui/views/external_protocol_dialog.cc

 // 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/ui/views/external_protocol_dialog.h"
 
 #include "base/metrics/histogram.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/win/registry.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
@@ skipping 162 matching lines @@
   std::wstring parameters = url_spec.substr(split_offset + 1,
                                             url_spec.length() - 1);
   std::wstring application_to_launch;
   if (cmd_key.ReadValue(NULL, &application_to_launch) == ERROR_SUCCESS) {
     ReplaceSubstringsAfterOffset(&application_to_launch, 0, L"%1", parameters);
     return application_to_launch;
   } else {
     return std::wstring();
   }
 }