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When an AXInlineTextBox::NextOnLine()/PrevOnLine() is used, the parent
of any newly created AXInlineTextBox is not necessarily going to be
the same one. Compute the correct parent in all cases.

Addresses DCHECKs that are triggered in text-overflow:ellipsis cases.

Bug: 1168643
Change-Id: Ib41bc4617bee4761ccad35ad94ab33fb8be4ab43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2639167Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Auto-Submit: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846087}