Use URLRequestContextBuilderMojo to create the SystemURLRequestContext.

net/proxy/dhcp_proxy_script_fetcher.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 "net/proxy/dhcp_proxy_script_fetcher.h"
 
 #include "net/base/net_errors.h"
 
 namespace net {
 
@@ skipping 15 matching lines @@
 }
 
 void DoNothingDhcpProxyScriptFetcher::Cancel() {}
 
 void DoNothingDhcpProxyScriptFetcher::OnShutdown() {}
 
 const GURL& DoNothingDhcpProxyScriptFetcher::GetPacURL() const {
   return gurl_;
 }
 
+std::string DoNothingDhcpProxyScriptFetcher::GetFetcherName() const {
+  return "do nothing";
+}
+
 }  // namespace net