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

net/proxy/dhcp_proxy_script_fetcher.h

Index: net/proxy/dhcp_proxy_script_fetcher.h
===================================================================
--- net/proxy/dhcp_proxy_script_fetcher.h	(revision 85647)
+++ net/proxy/dhcp_proxy_script_fetcher.h	(working copy)
@@ -1,98 +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_H_
-#define NET_PROXY_DHCP_SCRIPT_FETCHER_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/string16.h"
-#include "net/base/completion_callback.h"
-#include "net/proxy/proxy_script_fetcher.h"
-#include "net/url_request/url_request_context.h"
-
-namespace net {
-
-// Interface for classes that can fetch a proxy script as configured via DHCP.
-//
-// The Fetch method on this interface tries to retrieve the most appropriate
-// PAC script configured via DHCP.
-//
-// Normally there are zero or one DHCP scripts configured, but in the
-// presence of multiple adapters with DHCP enabled, the fetcher resolves
-// which PAC script to use if one or more are available.
-class DhcpProxyScriptFetcher {
- public:
-  // Destruction should cancel any outstanding requests.
-  virtual ~DhcpProxyScriptFetcher();
-
-  // Attempts to retrieve the most appropriate PAC script configured via DHCP,
-  // and invokes |callback| on completion.
-  //
-  // Returns OK on success, otherwise the error code. If the return code is
-  // ERR_IO_PENDING, then the request completes asynchronously, and |callback|
-  // will be invoked later with the final error code.
-  //
-  // After synchronous or asynchronous completion with a result code of OK,
-  // |*utf16_text| is filled with the response. On failure, the result text is
-  // an empty string, and the result code is a network error. Some special
-  // network errors that may occur are:
-  //
-  //    ERR_PAC_NOT_IN_DHCP   -- no script configured in DHCP.
-  //
-  //    The following all indicate there was one or more script configured
-  //    in DHCP but all failed to download, and the error for the most
-  //    preferred adapter that had a script configured was what the error
-  //    code says:
-  //
-  //      ERR_TIMED_OUT         -- fetch took too long to complete.
-  //      ERR_FILE_TOO_BIG      -- response body was too large.
-  //      ERR_PAC_STATUS_NOT_OK -- script failed to download.
-  //      ERR_NOT_IMPLEMENTED   -- script required authentication.
-  //
-  // If the request is cancelled (either using the "Cancel()" method or by
-  // deleting |this|), then no callback is invoked.
-  //
-  // Only one fetch is allowed to be outstanding at a time.
-  virtual int Fetch(string16* utf16_text,
-                    CompletionCallback* callback) = 0;
-
-  // Aborts the in-progress fetch (if any).
-  virtual void Cancel() = 0;
-
-  // After successful completion of |Fetch()|, this will return the URL
-  // retrieved from DHCP.  It is reset if/when |Fetch()| is called again.
-  virtual const GURL& GetPacURL() const = 0;
-
-  // Intended for unit tests only, so they can test that factories return
-  // the right types under given circumstances.
-  virtual std::string GetFetcherName() const;
-
- protected:
-  DhcpProxyScriptFetcher();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcher);
-};
-
-// A do-nothing retriever, always returns synchronously with
-// ERR_NOT_IMPLEMENTED result and empty text.
-class DoNothingDhcpProxyScriptFetcher : public DhcpProxyScriptFetcher {
- public:
-  DoNothingDhcpProxyScriptFetcher();
-  virtual ~DoNothingDhcpProxyScriptFetcher();
-
-  virtual int Fetch(string16* utf16_text,
-                    CompletionCallback* callback) OVERRIDE;
-  virtual void Cancel() OVERRIDE;
-  virtual const GURL& GetPacURL() const OVERRIDE;
- private:
-  GURL gurl_;
-  DISALLOW_COPY_AND_ASSIGN(DoNothingDhcpProxyScriptFetcher);
-};
-
-}  // namespace net
-
-#endif  // NET_PROXY_DHCP_SCRIPT_FETCHER_H_