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

chrome/browser/autocomplete/history_quick_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/history_quick_provider.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/i18n/break_iterator.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time.h"
 #include "chrome/browser/autocomplete/autocomplete_result.h"
 #include "chrome/browser/autocomplete/history_url_provider.h"
 #include "chrome/browser/history/history_database.h"
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/history/in_memory_url_index.h"
 #include "chrome/browser/history/in_memory_url_index_types.h"
 #include "chrome/browser/history/scored_history_match.h"
@@ skipping 389 matching lines @@
     do {
       offset += matches[i].length;
       ++i;
     } while ((i < match_count) && (offset == matches[i].offset));
     if (offset < text_length)
       spans.push_back(ACMatchClassification(offset, url_style));
   }
 
   return spans;
 }