Use a direct include of strings headers in chrome/auto*/.

chrome/browser/autocomplete/builtin_provider.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/autocomplete/builtin_provider.h"
 
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/browser/net/url_fixer_upper.h"
 #include "chrome/common/url_constants.h"
 
 namespace {
 
 // This list should be kept in sync with chrome/common/url_constants.h.
 // Only include useful sub-pages, confirmation alerts are not useful.
@@ skipping 95 matching lines @@
 void BuiltinProvider::AddMatch(const string16& match_string,
                                const ACMatchClassifications& styles) {
   AutocompleteMatch match(this, kRelevance, false,
                           AutocompleteMatchType::NAVSUGGEST);
   match.fill_into_edit = match_string;
   match.destination_url = GURL(match_string);
   match.contents = match_string;
   match.contents_class = styles;
   matches_.push_back(match);
 }