bindings: Use V8 MaybeLocal<> APIs in Dictionary class

Source/bindings/core/v8/CustomElementConstructorBuilder.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 193 matching lines @@
 }
 
 bool CustomElementConstructorBuilder::prototypeIsValid(const AtomicString& type, ExceptionState& exceptionState) const
 {
     if (m_prototype->InternalFieldCount() || !V8HiddenValue::getHiddenValue(m_scriptState->isolate(), m_prototype, V8HiddenValue::customElementIsInterfacePrototypeObject(m_scriptState->isolate())).IsEmpty()) {
         CustomElementException::throwException(CustomElementException::PrototypeInUse, type, exceptionState);
         return false;
     }
 
     v8::PropertyAttribute propertyAttribute;
-    if (!getValueFromMaybe(m_prototype->GetPropertyAttributes(m_scriptState->isolate()->GetCurrentContext(), v8String(m_scriptState->isolate(), "constructor")), propertyAttribute) || (propertyAttribute & v8::DontDelete)) {
+    if (!v8Call(m_prototype->GetPropertyAttributes(m_scriptState->isolate()->GetCurrentContext(), v8String(m_scriptState->isolate(), "constructor")), propertyAttribute) || (propertyAttribute & v8::DontDelete)) {
         CustomElementException::throwException(CustomElementException::ConstructorPropertyNotConfigurable, type, exceptionState);
         return false;
     }
 
     return true;
 }
 
 bool CustomElementConstructorBuilder::didRegisterDefinition(CustomElementDefinition* definition) const
 {
     ASSERT(!m_constructor.IsEmpty());
@@ skipping 44 matching lines @@
 
     ExceptionState exceptionState(ExceptionState::ConstructionContext, "CustomElement", info.Holder(), info.GetIsolate());
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     RefPtrWillBeRawPtr<Element> element = document->createElementNS(namespaceURI, tagName, maybeType->IsNull() ? nullAtom : type, exceptionState);
     if (exceptionState.throwIfNeeded())
         return;
     v8SetReturnValueFast(info, element.release(), document);
 }
 
 } // namespace blink