Do not commit InstantLoader server redirects till the page supports instant.

chrome/browser/instant/instant_loader.h

 // Copyright 2012 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 CHROME_BROWSER_INSTANT_INSTANT_LOADER_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_LOADER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 133 matching lines @@
   scoped_ptr<content::WebContents> contents_;
 
   const std::string instant_url_;
   bool supports_instant_;
   bool is_pointer_down_from_activate_;
   history::HistoryAddPageArgs last_navigation_;
 
   // Used to get notifications about renderers coming and going.
   content::NotificationRegistrar registrar_;
 
+  // An expected redirect, needs to be stored since
+  // DidCommitProvisionalLoadForFrame does not contain information if the load
+  // is the result of a redirect.
+  GURL expected_redirect_;
+
   DISALLOW_COPY_AND_ASSIGN(InstantLoader);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_LOADER_H_