Fix a bug where redirect chain gets lost on process swap.

chrome/browser/renderer_host/chrome_url_request_user_data.cc

 // 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.
 
 #include "chrome/browser/renderer_host/chrome_url_request_user_data.h"
 
 namespace {
 
 const char* const kKeyName = "chrome_url_request_user_data";
 
@@ skipping 12 matching lines @@
 
 // static
 ChromeURLRequestUserData* ChromeURLRequestUserData::Create(
     net::URLRequest* request) {
   DCHECK(request);
   DCHECK(!Get(request));
   ChromeURLRequestUserData* user_data = new ChromeURLRequestUserData();
   request->SetUserData(kKeyName, user_data);
   return user_data;
 }
+
+// static
+void ChromeURLRequestUserData::Delete(net::URLRequest* request) {
+  DCHECK(request);
+  request->SetUserData(kKeyName, NULL);
+}