[WIP] bindings: Introduce PropertyBag

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 a1eb2e9b2752bc1e189320392a4390f06bb994f6..fa9b234db90a2f157272dea3e5e8782a8570e9b1 100644
--- a/Source/bindings/core/v8/CustomElementConstructorBuilder.cpp
+++ b/Source/bindings/core/v8/CustomElementConstructorBuilder.cpp
@@ -73,7 +73,7 @@ bool CustomElementConstructorBuilder::validateOptions(const AtomicString& type,
     v8::TryCatch tryCatch;
 
     ScriptValue prototypeScriptValue;
-    if (DictionaryHelper::get(*m_options, "prototype", prototypeScriptValue) && !prototypeScriptValue.isNull()) {
+    if (m_options->get("prototype", prototypeScriptValue) && !prototypeScriptValue.isNull()) {
         ASSERT(!tryCatch.HasCaught());
         if (!prototypeScriptValue.isObject()) {
             CustomElementException::throwException(CustomElementException::PrototypeNotAnObject, type, exceptionState);
@@ -94,7 +94,7 @@ bool CustomElementConstructorBuilder::validateOptions(const AtomicString& type,
     }
 
     AtomicString extends;
-    bool extendsProvidedAndNonNull = DictionaryHelper::get(*m_options, "extends", extends) && extends != "null";
+    bool extendsProvidedAndNonNull = m_options->get("extends", extends) && extends != "null";
 
     if (tryCatch.HasCaught()) {
         tryCatch.ReThrow();