Makoto Kato fef13a2f66 Bug 1464251 - SplitNodeDeepWithTransaction might create orphan node. r=masayuki
SplitStyleAbovePoint calls SplitNodeDeepWithTransaction repeatedly. If
SplitNodeDeepWithTransaction creates orphan node like this test case,
this crash occurs.  So we should check whether node becomes orphan node.

Differential Revision: https://phabricator.services.mozilla.com/D1993

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