binding: Replaces DictionaryHelper::get(ScriptValue) with get(Nullable<T>).

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 110 matching lines @@
                                           T& value) {
     v8::Local<v8::Value> v8Value;
     if (!dictionary.get(key, v8Value) || isUndefinedOrNull(v8Value))
       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