Revert 85646 - Adds support for the DHCP portion of the WPAD (proxy auto-discovery) protocol.

net/proxy/proxy_script_fetcher_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 "net/proxy/proxy_script_fetcher_impl.h"
 
 #include "base/compiler_specific.h"
 #include "base/i18n/icu_string_conversions.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 153 matching lines @@
   cur_request_->Start();
   return ERR_IO_PENDING;
 }
 
 void ProxyScriptFetcherImpl::Cancel() {
   // ResetCurRequestState will free the URLRequest, which will cause
   // cancellation.
   ResetCurRequestState();
 }
 
-URLRequestContext* ProxyScriptFetcherImpl::GetRequestContext() const {
+URLRequestContext* ProxyScriptFetcherImpl::GetRequestContext() {
   return url_request_context_;
 }
 
 void ProxyScriptFetcherImpl::OnAuthRequired(URLRequest* request,
                                             AuthChallengeInfo* auth_info) {
   DCHECK_EQ(request, cur_request_.get());
   // TODO(eroman): http://crbug.com/77366
   LOG(WARNING) << "Auth required to fetch PAC script, aborting.";
   result_code_ = ERR_NOT_IMPLEMENTED;
   request->CancelAuth();
@@ skipping 122 matching lines @@
   // is still applicable.
   if (cur_request_id_ != id)
     return;
 
   DCHECK(cur_request_.get());
   result_code_ = ERR_TIMED_OUT;
   cur_request_->Cancel();
 }
 
 }  // namespace net