bindings: Use V8 MaybeLocal<> APIs in Dictionary class

Source/bindings/core/v8/CustomElementConstructorBuilder.cpp

Index: Source/bindings/core/v8/CustomElementConstructorBuilder.cpp
diff --git a/Source/bindings/core/v8/CustomElementConstructorBuilder.cpp b/Source/bindings/core/v8/CustomElementConstructorBuilder.cpp
index 580d99241d0a2f5e4b6e7719f1bc10edfc5e31b8..64b7fe887b29004a1cb41d5542c97b9e2b5d541c 100644
--- a/Source/bindings/core/v8/CustomElementConstructorBuilder.cpp
+++ b/Source/bindings/core/v8/CustomElementConstructorBuilder.cpp
@@ -211,7 +211,7 @@ bool CustomElementConstructorBuilder::prototypeIsValid(const AtomicString& type,
     }
 
     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;
     }