Add LayoutTest for crash with bidi isolates

Add LayoutTest for crash with bidi isolates

Merged from Blink (patch by jww@chromium.org):
https://src.chromium.org/viewvc/blink?revision=156580&view=revision
http://crbug.com/265838

See Bug 120504: Fix nested unicode-bidi: isolate
<https://bugs.webkit.org/show_bug.cgi?id=120504>
<http://trac.webkit.org/changeset/155554>

* fast/text/international/unicode-bidi-isolate-nested-with-removes-expected.txt: Added.
* fast/text/international/unicode-bidi-isolate-nested-with-removes.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@166645 268f45cc-cd09-0410-ab3c-d52691b4dbfc