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Refactor ReparentTab util.

ReparentTab and RevealAppShim are unrelated steps.

Bug: 915043
Change-Id: I37a1f463bf06e41e91c4bb0229a125af11903bd9
Reviewed-on: https://chromium-review.googlesource.com/c/1482432Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635419}