Summary of changes:
- Removed old XBL form control cruft.
- Made nsOutlinerContentView accessible from content scripts.
- Created a new interface, nsIDOMNSXBLFormControl which exists to allow a
select element to have an outliner box object.
- Factored out nsChildIterator into its own file.
- Added support to the outliner content view for having option elements
directly inserted in the outliner.
- Cleaned up pixel/twip conversions in outliner.
- Added support for intrinsic width for outliner.
r=jag, sr=hyatt. Note that the new select widget is NOT turned on by
default.
