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

net/proxy/proxy_script_fetcher_impl.cc

Index: net/proxy/proxy_script_fetcher_impl.cc
diff --git a/net/proxy/proxy_script_fetcher_impl.cc b/net/proxy/proxy_script_fetcher_impl.cc
index aabe34042c245e2e2986da6cabf2e4ffe58b2093..cfc2df45f5c5d7f140fc5702412797d45da76e54 100644
--- a/net/proxy/proxy_script_fetcher_impl.cc
+++ b/net/proxy/proxy_script_fetcher_impl.cc
@@ -115,28 +115,28 @@ void ProxyScriptFetcherImpl::OnResponseCompleted(URLRequest* request) {
   FetchCompleted();
 }
 
-int ProxyScriptFetcherImpl::Fetch(const GURL& url,
-                                  string16* text,
+int ProxyScriptFetcherImpl::Fetch(string16* text,
                                   CompletionCallback* callback) {
   // It is invalid to call Fetch() while a request is already in progress.
   DCHECK(!cur_request_.get());
 
   DCHECK(callback);
   DCHECK(text);
+  DCHECK(url_.is_valid());
 
   // Handle base-64 encoded data-urls that contain custom PAC scripts.
-  if (url.SchemeIs("data")) {
+  if (url_.SchemeIs("data")) {
     std::string mime_type;
     std::string charset;
     std::string data;
-    if (!DataURL::Parse(url, &mime_type, &charset, &data))
+    if (!DataURL::Parse(url_, &mime_type, &charset, &data))
       return ERR_FAILED;
 
     ConvertResponseToUTF16(charset, data, text);
     return OK;
   }
 
-  cur_request_.reset(new URLRequest(url, this));
+  cur_request_.reset(new URLRequest(url_, this));
   cur_request_->set_context(url_request_context_);
   cur_request_->set_method("GET");
 
@@ -171,10 +171,14 @@ void ProxyScriptFetcherImpl::Cancel() {
   ResetCurRequestState();
 }
 
-URLRequestContext* ProxyScriptFetcherImpl::GetRequestContext() {
+URLRequestContext* ProxyScriptFetcherImpl::GetRequestContext() const {
   return url_request_context_;
 }
 
+void ProxyScriptFetcherImpl::SetURL(const GURL& url) {
+  url_ = url;
+}
+
 void ProxyScriptFetcherImpl::OnAuthRequired(URLRequest* request,
                                             AuthChallengeInfo* auth_info) {
   DCHECK_EQ(request, cur_request_.get());