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

chrome/browser/instant/instant_controller.cc

 // 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.
 
 #include "chrome/browser/instant/instant_controller.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 852 matching lines @@
 void InstantController::InstantLoaderRenderViewGone() {
   ++blacklisted_urls_[loader_->instant_url()];
   HideInternal();
   delete loader_->ReleaseContents();
   // Delay deletion as we have gotten here from an InstantLoader method.
   MessageLoop::current()->DeleteSoon(FROM_HERE, loader_.release());
   CreateDefaultLoader();
 }
 
 void InstantController::InstantLoaderAboutToNavigateMainFrame(const GURL& url) {
+  // If the page does not yet support instant, we allow redirects and other
+  // navigations to go through since the instant URL can redirect - e.g. to
+  // country specific pages.
+  if (!loader_->supports_instant())
+    return;
+
   GURL instant_url(loader_->instant_url());
 
   // If we are navigating to the instant URL, do nothing.
   if (url == instant_url)
     return;
 
   // Commit the navigation if either:
   //  - The page is in NTP mode (so it could only navigate on a user click) or
   //  - The page is not in NTP mode and we are navigating to a URL with a
   //    different host or path than the instant URL. This enables the instant
@@ skipping 316 matching lines @@
   }
 
   std::map<std::string, int>::const_iterator iter =
       blacklisted_urls_.find(*instant_url);
   if (iter != blacklisted_urls_.end() &&
       iter->second > kMaxInstantSupportFailures)
     return false;
 
   return true;
 }