IsAccessWhiteListed(): avoid unnecessary stringification.

third_party/WebKit/Source/platform/weborigin/SecurityPolicy.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 161 matching lines @@
 
 bool SecurityPolicy::IsUrlWhiteListedTrustworthy(const KURL& url) {
   // Early return to avoid initializing the SecurityOrigin.
   if (TrustworthyOriginSet().IsEmpty())
     return false;
   return IsOriginWhiteListedTrustworthy(*SecurityOrigin::Create(url).Get());
 }
 
 bool SecurityPolicy::IsAccessWhiteListed(const SecurityOrigin* active_origin,
                                          const SecurityOrigin* target_origin) {
-  if (OriginAccessWhiteList* list =
-          GetOriginAccessMap().at(active_origin->ToString())) {
+  const OriginAccessMap& map = GetOriginAccessMap();
+  if (map.IsEmpty())
+    return false;
+  if (OriginAccessWhiteList* list = map.at(active_origin->ToString())) {
     for (size_t i = 0; i < list->size(); ++i) {
       if (list->at(i).MatchesOrigin(*target_origin) !=
           OriginAccessEntry::kDoesNotMatchOrigin)
         return true;
     }
   }
   return false;
 }
 
 bool SecurityPolicy::IsAccessToURLWhiteListed(
@@ skipping 116 matching lines @@
   }
 
   if (referrer_policy == kReferrerPolicyDefault)
     return false;
 
   *result = referrer_policy;
   return true;
 }
 
 }  // namespace blink