Revert of Move JoinString to the base namespace

chrome/browser/extensions/api/networking_private/crypto_verify_impl.cc

 // Copyright 2014 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/browser/extensions/api/networking_private/crypto_verify_impl.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 150 matching lines @@
   if (properties.intermediate_certificates.get())
     intermediate_certificates = *properties.intermediate_certificates;
   signed_data = properties.signed_data;
 
   std::vector<std::string> data_parts;
   data_parts.push_back(properties.device_ssid);
   data_parts.push_back(properties.device_serial);
   data_parts.push_back(properties.device_bssid);
   data_parts.push_back(properties.public_key);
   data_parts.push_back(properties.nonce);
-  unsigned_data = base::JoinString(data_parts, ",");
+  unsigned_data = JoinString(data_parts, ",");
 
   device_bssid = properties.device_bssid;
   public_key = properties.public_key;
 }
 
 CryptoVerifyImpl::Credentials::~Credentials() {
 }
 
 CryptoVerifyImpl::CryptoVerifyImpl() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
@@ skipping 46 matching lines @@
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   Credentials credentials(verification_properties);
   base::PostTaskAndReplyWithResult(
       blocking_pool_task_runner_.get(), FROM_HERE,
       base::Bind(&DoVerifyAndEncryptData, credentials, data),
       base::Bind(&VerifyAndEncryptDataCompleted, success_callback,
                  failure_callback));
 }
 
 }  // namespace extensions