Use a direct include of strings headers in chrome_frame/.

chrome_frame/test/mock_ie_event_sink_actions.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_ACTIONS_H_
 #define CHROME_FRAME_TEST_MOCK_IE_EVENT_SINK_ACTIONS_H_
 
 #include <windows.h>
 #include <algorithm>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
-#include "base/string_util.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_util.h"
 #include "base/test/test_process_killer_win.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome_frame/test/chrome_frame_test_utils.h"
 #include "chrome_frame/test/ie_event_sink.h"
 #include "chrome_frame/test/mock_ie_event_sink_test.h"
 #include "chrome_frame/test/simulate_input.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "ui/gfx/point.h"
@@ skipping 415 matching lines @@
 
   loop->PostDelayedTask(
       FROM_HERE,
       base::Bind(simulate_input::SendCharA, VK_RETURN, simulate_input::NONE),
       next_delay);
 }
 
 }  // namespace chrome_frame_test
 
 #endif  // CHROME_FRAME_TEST_MOCK_IE_EVENT_SINK_ACTIONS_H_