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

chrome/browser/autocomplete/autocomplete_provider_unittest.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/autocomplete_provider.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/string16.h"
-#include "base/string_util.h"
+#include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_controller.h"
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/autocomplete_provider_listener.h"
 #include "chrome/browser/autocomplete/keyword_provider.h"
 #include "chrome/browser/autocomplete/search_provider.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
@@ skipping 583 matching lines @@
   EXPECT_EQ("//aqs=chrome.0.69i57j69i58j5l2j0l3j69i59.2456j0&", url.path());
 
   // Test field trial triggered bit set.
   controller_->search_provider_->field_trial_triggered_in_session_ = true;
   EXPECT_TRUE(
       controller_->search_provider_->field_trial_triggered_in_session());
   url = controller_->GetDestinationURL(match,
                                        base::TimeDelta::FromMilliseconds(2456));
   EXPECT_EQ("//aqs=chrome.0.69i57j69i58j5l2j0l3j69i59.2456j1&", url.path());
 }