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

chrome/browser/spellchecker/feedback_sender_unittest.cc

 // Copyright (c) 2013 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 <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/message_loop.h"
 #include "base/metrics/field_trial.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/spellchecker/feedback_sender.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/metrics/entropy_provider.h"
 #include "chrome/common/spellcheck_common.h"
 #include "chrome/common/spellcheck_marker.h"
 #include "chrome/common/spellcheck_result.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread.h"
@@ skipping 528 matching lines @@
   feedback_->OnReceiveDocumentMarkers(kRendererProcessId,
                                       std::vector<uint32>());
   net::TestURLFetcher* fetcher = GetFetcher();
   EXPECT_EQ(1, CountOccurences(fetcher->upload_data(), "SELECT"))
       << fetcher->upload_data();
   EXPECT_EQ(2, CountOccurences(fetcher->upload_data(), "ADD_TO_DICT"))
       << fetcher->upload_data();
 }
 
 }  // namespace spellcheck