Use a direct include of strings headers in chrome_frame/.

chrome_frame/bind_status_callback_impl.cc

 // Copyright (c) 2011 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/bind_status_callback_impl.h"
 
 #include "base/logging.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/threading/platform_thread.h"
 
 BSCBImpl::BSCBImpl() {
   DVLOG(1) << __FUNCTION__ << me();
 }
 
 BSCBImpl::~BSCBImpl() {
   DVLOG(1) << __FUNCTION__ << me();
 }
 
@@ skipping 204 matching lines @@
   HRESULT hr = S_OK;
   if (delegate_) {
     base::win::ScopedComPtr<IHttpNegotiate3> http_negotiate;
     http_negotiate.QueryFrom(delegate_);
     if (http_negotiate) {
       return http_negotiate->GetSerializedClientCertContext(cert, cert_size);
     }
   }
   return hr;
 }