Revert r23616 from 172.

net/proxy/proxy_script_fetcher.cc

Index: net/proxy/proxy_script_fetcher.cc
===================================================================
--- net/proxy/proxy_script_fetcher.cc	(revision 23699)
+++ net/proxy/proxy_script_fetcher.cc	(working copy)
@@ -51,6 +51,7 @@
                               AuthChallengeInfo* auth_info);
   virtual void OnSSLCertificateError(URLRequest* request, int cert_error,
                                      X509Certificate* cert);
+  virtual void OnReceivedRedirect(URLRequest* request, const GURL& to_url);
   virtual void OnResponseStarted(URLRequest* request);
   virtual void OnReadCompleted(URLRequest* request, int num_bytes);
   virtual void OnResponseCompleted(URLRequest* request);
@@ -177,6 +178,12 @@
   request->Cancel();
 }
 
+void ProxyScriptFetcherImpl::OnReceivedRedirect(URLRequest* request,
+                                                const GURL& to_url) {
+  DCHECK(request == cur_request_.get());
+  // OK, thanks for telling.
+}
+
 void ProxyScriptFetcherImpl::OnResponseStarted(URLRequest* request) {
   DCHECK(request == cur_request_.get());