Fix bug in PrerenderLocalPredictor

chrome/browser/prerender/prerender_local_predictor.cc

 // Copyright (c) 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/prerender/prerender_local_predictor.h"
 
 #include <ctype.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 1145 matching lines @@
       RecordEvent(EVENT_CONTINUE_PRERENDER_CHECK_LOGOUT_URL);
       url_info.reset(NULL);
       continue;
     }
     if (IsLogInURL(url_info->url)) {
       RecordEvent(EVENT_CONTINUE_PRERENDER_CHECK_LOGIN_URL);
       url_info.reset(NULL);
       continue;
     }
 #if defined(FULL_SAFE_BROWSING)
-    if (!SkipLocalPredictorWhitelist() &&
+    if (!SkipLocalPredictorWhitelist() && sb_db_manager &&
         sb_db_manager->CheckSideEffectFreeWhitelistUrl(url_info->url)) {
       // If a page is on the side-effect free whitelist, we will just prerender
       // it without any additional checks.
       RecordEvent(EVENT_CONTINUE_PRERENDER_CHECK_ON_SIDE_EFFECT_FREE_WHITELIST);
       break;
     }
 #endif
     if (!SkipLocalPredictorServiceWhitelist() &&
         url_info->service_whitelist && url_info->service_whitelist_lookup_ok) {
       RecordEvent(EVENT_CONTINUE_PRERENDER_CHECK_ON_SERVICE_WHITELIST);
@@ skipping 187 matching lines @@
       break;
     case content::SessionStorageNamespace::MERGE_RESULT_MERGEABLE:
       RecordEvent(EVENT_NAMESPACE_MISMATCH_MERGE_RESULT_MERGEABLE);
       break;
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace prerender