IDL: Add more test cases to idl-dictionary-unittest.html

Source/bindings/core/v8/DictionaryHelperForCore.cpp

Index: Source/bindings/core/v8/DictionaryHelperForCore.cpp
diff --git a/Source/bindings/core/v8/DictionaryHelperForCore.cpp b/Source/bindings/core/v8/DictionaryHelperForCore.cpp
index eed1950df6748cc6ed7a99ee0957e52f82bee468..6a1f7fc8d3022d76110ce2da5c7cbcb2d505ea79 100644
--- a/Source/bindings/core/v8/DictionaryHelperForCore.cpp
+++ b/Source/bindings/core/v8/DictionaryHelperForCore.cpp
@@ -471,11 +471,17 @@ struct DictionaryHelperTraits<Storage> {
     typedef V8Storage type;
 };
 
+template <>
+struct DictionaryHelperTraits<Element> {
+    typedef V8Element type;
+};
+
 template bool DictionaryHelper::get(const Dictionary&, const String& key, RefPtr<Uint8Array>& value);
 template bool DictionaryHelper::get(const Dictionary&, const String& key, RefPtr<ArrayBufferView>& value);
 template bool DictionaryHelper::get(const Dictionary&, const String& key, RefPtrWillBeMember<MediaKeyError>& value);
 template bool DictionaryHelper::get(const Dictionary&, const String& key, RefPtrWillBeMember<DOMError>& value);
 template bool DictionaryHelper::get(const Dictionary&, const String& key, RefPtrWillBeMember<Storage>& value);
+template bool DictionaryHelper::get(const Dictionary&, const String& key, RefPtrWillBeMember<Element>& value);
 
 template <typename T>
 struct IntegralTypeTraits {