Fixes crash if instant is enabled and you block JS.

chrome/browser/instant/instant_loader.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/instant/instant_loader.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 526 matching lines @@
 }
 
 void InstantLoader::TabContentsDelegateImpl::OnInstantSupportDetermined(
     int32 page_id,
     bool result) {
   TabContents* source = loader_->preview_contents()->tab_contents();
   if (!source->controller().GetActiveEntry() ||
       page_id != source->controller().GetActiveEntry()->page_id())
     return;
 
+  Details<const bool> details(&result);
+  NotificationService::current()->Notify(
+      NotificationType::INSTANT_SUPPORT_DETERMINED,
+      NotificationService::AllSources(),
+      details);
+
   if (result)
     loader_->PageFinishedLoading();
   else
     loader_->PageDoesntSupportInstant(user_typed_before_load_);
 }
 
 bool InstantLoader::TabContentsDelegateImpl::ShouldShowHungRendererDialog() {
   // If we allow the hung renderer dialog to be shown it'll gain focus,
   // stealing focus from the omnibox causing instant to be cancelled. Return
   // false so that doesn't happen.
@@ skipping 395 matching lines @@
       Source<NavigationController>(&preview_contents_->controller()));
 #endif
 
   registrar_.Add(
       this,
       NotificationType::NAV_ENTRY_COMMITTED,
       Source<NavigationController>(&preview_contents_->controller()));
 
   preview_contents_->tab_contents()->ShowContents();
 }