Fix a browser crash when typing a disabled extension keyword in an

chrome/browser/autocomplete/autocomplete_popup_model.cc

 // Copyright (c) 2010 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/autocomplete/autocomplete_popup_model.h"
 
 #include "unicode/ubidi.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
@@ skipping 204 matching lines @@
       TemplateURLModel::CleanUserInputKeyword(match.fill_into_edit));
   if (keyword_hint.empty())
     return false;
 
   // Don't provide a hint if this keyword doesn't support replacement.
   const TemplateURL* const template_url =
       profile_->GetTemplateURLModel()->GetTemplateURLForKeyword(keyword_hint);
   if (!TemplateURL::SupportsReplacement(template_url))
     return false;
 
-  // Don't provide a hint if this is an extension keyword not enabled for
-  // incognito mode (and if this is an incognito profile).
-  if (template_url->IsExtensionKeyword() && profile_->IsOffTheRecord()) {
+  // Don't provide a hint for inactive/disabled extension keywords.
+  if (template_url->IsExtensionKeyword()) {
     const Extension* extension = profile_->GetExtensionsService()->
         GetExtensionById(template_url->GetExtensionId(), false);
-    if (!profile_->GetExtensionsService()->IsIncognitoEnabled(extension))
+    if (!extension ||
+        (profile_->IsOffTheRecord() &&
+         !profile_->GetExtensionsService()->IsIncognitoEnabled(extension)))
       return false;
   }
 
   keyword->assign(keyword_hint);
   return true;
 }
 
 void AutocompletePopupModel::FinalizeInstantQuery(const std::wstring& text) {
   if (IsOpen()) {
     SearchProvider* search_provider = controller_->search_provider();
@@ skipping 74 matching lines @@
 }
 
 const SkBitmap* AutocompletePopupModel::GetSpecialIconForMatch(
     const AutocompleteMatch& match) const {
   if (!match.template_url || !match.template_url->IsExtensionKeyword())
     return NULL;
 
   return &profile_->GetExtensionsService()->GetOmniboxPopupIcon(
       match.template_url->GetExtensionId());
 }