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

net/proxy/dhcp_proxy_script_fetcher_factory.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_factory.h"
-
-#include "net/base/net_errors.h"
-#include "net/proxy/dhcp_proxy_script_fetcher.h"
-
-#if defined(OS_WIN)
-#include "net/proxy/dhcp_proxy_script_fetcher_win.h"
-#endif
-
-namespace net {
-
-DhcpProxyScriptFetcherFactory::DhcpProxyScriptFetcherFactory() {
-  // TODO(joi): Change this default, and the comment on |set_enabled()|,
-  // when the time is right.
-  set_enabled(false);
-}
-
-DhcpProxyScriptFetcher* DhcpProxyScriptFetcherFactory::Create(
-    URLRequestContext* context) {
-  if (!feature_enabled_) {
-    return new DoNothingDhcpProxyScriptFetcher();
-  } else {
-    DCHECK(IsSupported());
-    DhcpProxyScriptFetcher* ret = NULL;
-#if defined(OS_WIN)
-    ret = new DhcpProxyScriptFetcherWin(context);
-#endif
-    DCHECK(ret);
-    return ret;
-  }
-}
-
-void DhcpProxyScriptFetcherFactory::set_enabled(bool enabled) {
-  if (IsSupported()) {
-    feature_enabled_ = enabled;
-  }
-}
-
-bool DhcpProxyScriptFetcherFactory::enabled() const {
-  return feature_enabled_;
-}
-
-// static
-bool DhcpProxyScriptFetcherFactory::IsSupported() {
-#if defined(OS_WIN)
-  return true;
-#else
-  return false;
-#endif
-}
-
-}  // namespace net