Potential use after free in ApplyStyleCommand::splitAncestorsWithUnicodeBidi
https://bugs.webkit.org/show_bug.cgi?id=114664

Reviewed by Oliver Hunt.

Use RefPtr as needed.

No new tests since this bug was discovered by code inspection.

* editing/ApplyStyleCommand.cpp:
(WebCore::ApplyStyleCommand::splitAncestorsWithUnicodeBidi):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148497 268f45cc-cd09-0410-ab3c-d52691b4dbfc