Use a direct include of strings headers in remoting/.

remoting/host/token_validator_factory_impl.cc

 // Copyright 2013 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 "remoting/host/token_validator_factory_impl.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/json/json_reader.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/values.h"
 #include "crypto/random.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/escape.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_status.h"
 #include "remoting/base/rsa_key_pair.h"
 
 namespace {
@@ skipping 155 matching lines @@
 TokenValidatorFactoryImpl::CreateTokenValidator(
     const std::string& local_jid,
     const std::string& remote_jid) {
   return scoped_ptr<protocol::ThirdPartyHostAuthenticator::TokenValidator>(
       new TokenValidatorImpl(token_url_, token_validation_url_, key_pair_,
                              local_jid, remote_jid,
                              request_context_getter_));
 }
 
 }  // namespace remoting