Better match IE's proxy settings....

net/proxy/proxy_resolver_winhttp.cc

 // Copyright (c) 2006-2008 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_resolver_winhttp.h"
 
 #include <windows.h>
 #include <winhttp.h>
 
 #include "base/histogram.h"
@@ skipping 52 matching lines @@
   // If we have been given an empty PAC url, then use auto-detection.
   //
   // NOTE: We just use DNS-based auto-detection here like Firefox.  We do this
   // to avoid WinHTTP's auto-detection code, which while more featureful (it
   // supports DHCP based auto-detection) also appears to have issues.
   //
   WINHTTP_AUTOPROXY_OPTIONS options = {0};
   options.fAutoLogonIfChallenged = FALSE;
   options.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL;
   std::wstring pac_url_wide = ASCIIToWide(pac_url_.spec());
-  options.lpszAutoConfigUrl =
-      pac_url_wide.empty() ? L"http://wpad/wpad.dat" : pac_url_wide.c_str();
+  options.lpszAutoConfigUrl = pac_url_wide.c_str();
 
   WINHTTP_PROXY_INFO info = {0};
   DCHECK(session_handle_);
 
   // Per http://msdn.microsoft.com/en-us/library/aa383153(VS.85).aspx, it is
   // necessary to first try resolving with fAutoLogonIfChallenged set to false.
   // Otherwise, we fail over to trying it with a value of true.  This way we
   // get good performance in the case where WinHTTP uses an out-of-process
   // resolver.  This is important for Vista and Win2k3.
   BOOL ok = CallWinHttpGetProxyForUrl(
@@ skipping 48 matching lines @@
 
   FreeInfo(&info);
   return rv;
 }
 
 void ProxyResolverWinHttp::CancelRequest(RequestHandle request) {
   // This is a synchronous ProxyResolver; no possibility for async requests.
   NOTREACHED();
 }
 
-void ProxyResolverWinHttp::SetPacScriptByUrlInternal(const GURL& pac_url) {
-  pac_url_ = pac_url;
+int ProxyResolverWinHttp::SetPacScript(const GURL& pac_url,
+                                       const std::string& /*pac_bytes*/,
+                                       CompletionCallback* /*callback*/) {
+  pac_url_ = pac_url.is_valid() ? pac_url : GURL("http://wpad/wpad.dat");
+  return OK;
 }
 
 bool ProxyResolverWinHttp::OpenWinHttpSession() {
   DCHECK(!session_handle_);
   session_handle_ = WinHttpOpen(NULL,
                                 WINHTTP_ACCESS_TYPE_NO_PROXY,
                                 WINHTTP_NO_PROXY_NAME,
                                 WINHTTP_NO_PROXY_BYPASS,
                                 0);
   if (!session_handle_)
@@ skipping 10 matching lines @@
 }
 
 void ProxyResolverWinHttp::CloseWinHttpSession() {
   if (session_handle_) {
     WinHttpCloseHandle(session_handle_);
     session_handle_ = NULL;
   }
 }
 
 }  // namespace net