Use a direct include of strings headers in chrome_frame/.

chrome_frame/test/ie_event_sink.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_frame/test/ie_event_sink.h"
 
 #include <shlguid.h>
 #include <shobjidl.h>
 
 #include <map>
 #include <utility>
 
 #include "base/lazy_instance.h"
-#include "base/string_number_conversions.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/test_timeouts.h"
 #include "base/time.h"
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_variant.h"
 #include "chrome_frame/test/chrome_frame_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::win::ScopedBstr;
@@ skipping 743 matching lines @@
           source.Receive(), NULL, NULL));
     }
   }
 
   if (listener_)
     listener_->OnMessage(V_BSTR(&data), V_BSTR(&origin), V_BSTR(&source));
   return S_OK;
 }
 
 }  // namespace chrome_frame_test