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

net/proxy/dhcp_proxy_script_fetcher_factory.h

Index: net/proxy/dhcp_proxy_script_fetcher_factory.h
===================================================================
--- net/proxy/dhcp_proxy_script_fetcher_factory.h	(revision 85647)
+++ net/proxy/dhcp_proxy_script_fetcher_factory.h	(working copy)
@@ -1,68 +0,0 @@
-// 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.
-
-#ifndef NET_PROXY_DHCP_SCRIPT_FETCHER_FACTORY_H_
-#define NET_PROXY_DHCP_SCRIPT_FETCHER_FACTORY_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/memory/singleton.h"
-#include "net/base/completion_callback.h"
-#include "net/url_request/url_request_context.h"
-
-namespace net {
-
-class DhcpProxyScriptFetcher;
-
-// Factory object for creating the appropriate concrete base class of
-// DhcpProxyScriptFetcher for your operating system and settings.
-//
-// You might think we could just implement a DHCP client at the protocol
-// level and have cross-platform support for retrieving PAC configuration
-// from DHCP, but unfortunately the DHCP protocol assumes there is a single
-// client per machine (specifically per network interface card), and there
-// is an implicit state machine between the client and server, so adding a
-// second client to the machine would not be advisable (see e.g. some
-// discussion of what can happen at this URL:
-// http://www.net.princeton.edu/multi-dhcp-one-interface-handling.html).
-//
-// Therefore, we have platform-specific implementations, and so we use
-// this factory to select the right one.
-class DhcpProxyScriptFetcherFactory {
- public:
-  // Creates a new factory object with default settings.
-  DhcpProxyScriptFetcherFactory();
-
-  // Ownership is transferred to the caller. url_request_context must be valid
-  // and its lifetime must exceed that of the returned DhcpProxyScriptFetcher.
-  //
-  // Note that while a request is in progress, the fetcher may be holding a
-  // reference to |url_request_context|. Be careful not to create cycles
-  // between the fetcher and the context; you can break such cycles by calling
-  // Cancel().
-  DhcpProxyScriptFetcher* Create(URLRequestContext* url_request_context);
-
-  // Attempts to enable/disable the DHCP WPAD feature.  Does nothing
-  // if |IsSupported()| returns false.
-  //
-  // The current default is |enabled() == false|.
-  void set_enabled(bool enabled);
-
-  // Returns true if the DHCP WPAD feature is enabled.  Always returns
-  // false if |IsSupported()| is false.
-  bool enabled() const;
-
-  // Returns true if the DHCP WPAD feature is supported on the current
-  // operating system.
-  static bool IsSupported();
-
- protected:
-  bool feature_enabled_;
-
-  DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcherFactory);
-};
-
-}  // namespace net
-
-#endif  // NET_PROXY_DHCP_SCRIPT_FETCHER_FACTORY_H_