Add support for [PutForwards] IDL extended attribute

Source/core/dom/Document.idl

Index: Source/core/dom/Document.idl
diff --git a/Source/core/dom/Document.idl b/Source/core/dom/Document.idl
index 010eb4440bc3bba1f160d264d066705d599ea9dc..5ca7bf8b0bd14004c1411181527b030775427743 100644
--- a/Source/core/dom/Document.idl
+++ b/Source/core/dom/Document.idl
@@ -130,7 +130,7 @@ callback CustomElementConstructor = Element ();
 
     [PerWorldBindings] NodeList getElementsByName([Default=Undefined] optional DOMString elementName);
 
-    [Custom, Replaceable, PerWorldBindings, ActivityLogging=AccessForIsolatedWorlds] readonly attribute Location location;

[Inactive, 2013/10/14 21:18:10]

I removed [Replaceable, PerWorldBindings] because they had no impact on the
generated code (since it was custom code).

- [Replaceable] is not in the specification so I don't think we want this
anyway.
- However, let me know if you would like me to keep [PerWorldBindings]. We can
actually use [PerWorldBindings] now that the code is generated.

[haraken, 2013/10/15 00:15:37]

Removing [Replaceable] sounds reasonable.
Just to confirm: Does [ActivityLogging] imply [PerWorldBindings]?
[ActivityLogging] requires per-world binding code. If [ActivityLogging] implies
[PerWorldBindings], I'm OK with removing [PerWorldBindings].

+    [ActivityLogging=AccessForIsolatedWorlds, PutForwards=href] readonly attribute Location location;
 
     // IE extensions
     [MeasureAs=DocumentCharset, TreatReturnedNullStringAs=Undefined, TreatNullAs=NullString] attribute DOMString charset;