Revert of IDL: Null values should be converted for non-nullable dictionary members

LayoutTests/fast/dom/idl-dictionary-unittest.html

Index: LayoutTests/fast/dom/idl-dictionary-unittest.html
diff --git a/LayoutTests/fast/dom/idl-dictionary-unittest.html b/LayoutTests/fast/dom/idl-dictionary-unittest.html
index d855f128c0fd279aaac7f1ec1d8225a1767d2b5f..897f0f719f1447828d4a88e12245f3d02fc42d77 100644
--- a/LayoutTests/fast/dom/idl-dictionary-unittest.html
+++ b/LayoutTests/fast/dom/idl-dictionary-unittest.html
@@ -124,6 +124,10 @@
         doubleOrStringMember: null,
     });
     dict = dictionaryTest.get();
+    // This behavior doesn't match the spec. The spec says it should be "null"
+    // (of type string). This is an intentional mismatch; however, we might
+    // want to follow the spec at some time.
+    debug('This FAIL is intentional');
     shouldBeEqualToString('dict.doubleOrStringMember', 'null');
     dictionaryTest.set({
         doubleOrStringMember: undefined,
@@ -142,9 +146,7 @@
     });
     dict = dictionaryTest.get();
     shouldBeUndefined('dict.longMember');
-    // ToNumber(null) results in 0.
-    shouldBe('dict.longMemberWithDefault', '0');
-    // Passing undefined shouldn't invoke any conversion.
+    shouldBe('dict.longMemberWithDefault', '42');
     shouldBeUndefined('dict.longOrNullMember');
     // Nullable and its default value is null
     shouldBeNull('dict.longOrNullMemberWithDefault');