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

net/proxy/dhcp_proxy_script_fetcher.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/dhcp_proxy_script_fetcher.h"
-
-#include "net/base/net_errors.h"
-
-namespace net {
-
-DhcpProxyScriptFetcher::DhcpProxyScriptFetcher() {
-}
-
-DhcpProxyScriptFetcher::~DhcpProxyScriptFetcher() {
-}
-
-std::string DhcpProxyScriptFetcher::GetFetcherName() const {
-  return "";
-}
-
-DoNothingDhcpProxyScriptFetcher::DoNothingDhcpProxyScriptFetcher() {
-}
-
-DoNothingDhcpProxyScriptFetcher::~DoNothingDhcpProxyScriptFetcher() {
-}
-
-int DoNothingDhcpProxyScriptFetcher::Fetch(string16* utf16_text,
-                                           CompletionCallback* callback) {
-  return ERR_NOT_IMPLEMENTED;
-}
-
-void DoNothingDhcpProxyScriptFetcher::Cancel() {
-}
-
-const GURL& DoNothingDhcpProxyScriptFetcher::GetPacURL() const {
-  return gurl_;
-}
-
-}  // namespace net