bindings: Remove [EventConstructor] and [InitializedByEventConstructor]

Source/bindings/core/v8/DictionaryHelperForBindings.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 24 matching lines @@
 bool DictionaryHelper::get(const Dictionary& dictionary, const String& key, PointerType<T>& value)
 {
     v8::Local<v8::Value> v8Value;
     if (!dictionary.get(key, v8Value))
         return false;
 
     value = V8TypeOf<T>::Type::toImplWithTypeCheck(dictionary.isolate(), v8Value);
     return true;
 }
 
-template <template <typename> class PointerType, typename T>
-bool DictionaryHelper::convert(const Dictionary& dictionary, Dictionary::ConversionContext& context, const String& key, PointerType<T>& value)
-{
-    Dictionary::ConversionContextScope scope(context);
-
-    if (!DictionaryHelper::get(dictionary, key, value))
-        return true;
-
-    if (value)
-        return true;
-
-    v8::Local<v8::Value> v8Value;
-    dictionary.get(key, v8Value);
-    if (context.isNullable() && blink::isUndefinedOrNull(v8Value))
-        return true;
-
-    context.throwTypeError(ExceptionMessages::incorrectPropertyType(key, "does not have a " + context.typeName() + " type."));
-    return false;
-}
-
 } // namespace blink
 
 #endif // DictionaryHelperForBindings_h