Simplify Dictionary::ConversionContext

Source/bindings/templates/interface.h

 // Copyright 2014 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.
 
 // This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
 #ifndef {{v8_class}}_h
 #define {{v8_class}}_h
 
 {% filter conditional(conditional_string) %}
@@ skipping 217 matching lines @@
 template<typename CallbackInfo, typename Wrappable>
 inline void v8SetReturnValueFast(const CallbackInfo& callbackInfo, {{cpp_class}}* impl, Wrappable*)
 {
     // Since |impl| is not ScriptWrappable, it doesn't matter much if it's the
     // main world or not.
     return v8SetReturnValue(callbackInfo, impl);
 }
 
 {% endif %}{# has_custom_to_v8 #}
 {% if has_event_constructor %}
-bool initialize{{cpp_class}}({{cpp_class}}Init&, const Dictionary&, ExceptionState&, const v8::FunctionCallbackInfo<v8::Value>& info, const String& = "");
+bool initialize{{cpp_class}}({{cpp_class}}Init&, const Dictionary&, ExceptionState&, const v8::FunctionCallbackInfo<v8::Value>& info);
 
 {% endif %}
 } // namespace blink
 {% endfilter %}
 
 #endif // {{v8_class}}_h