Force horizontal list to be horizontal scrollable even if it doesn't need scroll. We already have this bounce effect for vertical list. Add horizontal bounce to make behavior consistent.
Created attachment 196861 [details] Patch with Changelog
Comment on attachment 196861 [details] Patch with Changelog LGTM.
Comment on attachment 196861 [details] Patch with Changelog Clearing flags on attachment: 196861 Committed r147936: <http://trac.webkit.org/changeset/147936>
All reviewed patches have been landed. Closing bug.