Use a direct include of strings headers in chrome/browser/r*-s*/.

chrome/browser/signin/oauth2_token_service_unittest.cc

 // Copyright 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 <string>
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "chrome/browser/signin/oauth2_token_service.h"
 #include "chrome/browser/signin/oauth2_token_service_test_util.h"
 #include "chrome/browser/signin/token_service_factory.h"
 #include "chrome/browser/signin/token_service_unittest.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "google_apis/gaia/gaia_constants.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "google_apis/gaia/oauth2_access_token_consumer.h"
 #include "net/http/http_status_code.h"
@@ skipping 444 matching lines @@
   EXPECT_EQ(0, consumer_.number_of_errors_);
   fetcher = factory_.GetFetcherByID(0);
   EXPECT_TRUE(fetcher);
   fetcher->set_response_code(net::HTTP_OK);
   fetcher->SetResponseString(GetValidTokenResponse("token2", 3600));
   fetcher->delegate()->OnURLFetchComplete(fetcher);
   EXPECT_EQ(3, consumer_.number_of_successful_tokens_);
   EXPECT_EQ(0, consumer_.number_of_errors_);
   EXPECT_EQ("token2", consumer_.last_token_);
 }