Use a direct include of strings headers in chrome_frame/.

chrome_frame/test/mock_ie_event_sink_test.h

 // 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.
 
 #ifndef CHROME_FRAME_TEST_MOCK_IE_EVENT_SINK_TEST_H_
 #define CHROME_FRAME_TEST_MOCK_IE_EVENT_SINK_TEST_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
-#include "base/string_number_conversions.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/object_watcher.h"
 #include "chrome_frame/test/chrome_frame_test_utils.h"
 #include "chrome_frame/test/chrome_frame_ui_test_utils.h"
 #include "chrome_frame/test/ie_event_sink.h"
 #include "chrome_frame/test/test_server.h"
 #include "chrome_frame/test/test_with_web_server.h"
 #include "chrome_frame/test/win_event_receiver.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 333 matching lines @@
   testing::StrictMock<MockIEEventSink> ie_mock_;
   testing::StrictMock<MockWebServer> server_mock_;
   scoped_refptr<HungCOMCallDetector> hung_call_detector_;
  private:
   DISALLOW_COPY_AND_ASSIGN(MockIEEventSinkTest);
 };
 
 }  // namespace chrome_frame_test
 
 #endif  // CHROME_FRAME_TEST_MOCK_IE_EVENT_SINK_TEST_H_