bindings: Support (deprecated) Dictionary in IDL dictionary

LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt

Index: LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
diff --git a/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt b/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
index 07797a17928b2be917fd83e4e6fe6b9b8dc4036e..44a89782ec67060cd0ea766ab88c872a18f22bcc 100644
--- a/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
+++ b/LayoutTests/fast/dom/idl-dictionary-unittest-expected.txt
@@ -141,6 +141,14 @@ PASS dictionaryTest.set({eventTargetOrNullMember: 42}) threw exception TypeError
 PASS dictionaryTest.set({eventTargetOrNullMember: []}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member eventTargetOrNullMember is not of type EventTarget..
 PASS dictionaryTest.set({eventTargetOrNullMember: {}}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member eventTargetOrNullMember is not of type EventTarget..
 
+Test for passing Dictionary (not IDL dictionary)
+PASS properties.foo is "x"
+PASS properties.bar is "y"
+PASS properties.baz is undefined.
+PASS properties is {}
+PASS dictionaryTest.set({dictionaryMember: 42}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member dictionaryMember is not an object..
+PASS dictionaryTest.set({dictionaryMember: 'foo'}) threw exception TypeError: Failed to execute 'set' on 'DictionaryTest': member dictionaryMember is not an object..
+
 Test for derived dictionary
 PASS derived.longMember is undefined.
 PASS derived.longMemberWithDefault is 42