Use a direct include of strings headers in chrome_frame/.

chrome_frame/http_negotiate.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/http_negotiate.h"
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <htiframe.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome_frame/bho.h"
 #include "chrome_frame/exception_barrier.h"
 #include "chrome_frame/html_utils.h"
 #include "chrome_frame/urlmon_moniker.h"
 #include "chrome_frame/urlmon_url_request.h"
 #include "chrome_frame/utils.h"
 #include "chrome_frame/vtable_patch_manager.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_util.h"
@@ skipping 256 matching lines @@
     *additional_headers = reinterpret_cast<wchar_t*>(::CoTaskMemRealloc(
         *additional_headers,
         (updated_headers.length() + 1) * sizeof(wchar_t)));
     lstrcpyW(*additional_headers, ASCIIToWide(updated_headers).c_str());
   } else {
     // TODO(erikwright): Remove the user agent if it is present (i.e., because
     // of PostPlatform setting in the registry).
   }
   return S_OK;
 }