Fetch API: Fix behavior when Request constructor is passed an undefined referrer

third_party/WebKit/Source/bindings/core/v8/Dictionary.h

 /*
  * Copyright (C) 2010 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 115 matching lines @@
   static bool get(const Dictionary&,
                   const StringView& key,
                   T& value,
                   bool& hasValue);
   template <typename T>
   static bool get(const Dictionary&,
                   const StringView& key,
                   T& value,
                   ExceptionState&);
   template <typename T>
-  static bool getWithUndefinedOrNullCheck(const Dictionary& dictionary,
-                                          const StringView& key,
-                                          T& value) {
+  static bool getWithUndefinedCheck(const Dictionary& dictionary,
+                                    const StringView& key,
+                                    T& value) {
     v8::Local<v8::Value> v8Value;
-    if (!dictionary.get(key, v8Value) || isUndefinedOrNull(v8Value))
+    if (!dictionary.get(key, v8Value) || v8Value.IsEmpty() ||
+        v8Value->IsUndefined())
       return false;
     return DictionaryHelper::get(dictionary, key, value);
   }
   template <template <typename> class PointerType, typename T>
   static bool get(const Dictionary&,
                   const StringView& key,
                   PointerType<T>& value);
   template <typename T>
   static bool get(const Dictionary&, const StringView& key, Nullable<T>& value);
 };
 
 }  // namespace blink
 
 #endif  // Dictionary_h