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This reverts commit 96b864cc.

Reason for revert: This sometimes results in mangled .app bundles, needs a cleaner solution.

Original change's description:
> MacPWAs: Reparent tabs when installing PWAs
> 
> This works now. When re-parenting the window, the initial attempt to
> re-parent the window fails, because the PWA's bundle has not yet
> been created. The second attempt then re-creates the bundle and
> succeeds. This is a bit kludgey in that it is possible that the bundle
> will be recreated twice.
> 
> A cleaner solution would be to delay reparenting the contents and
> revealing the app in Finder until the app has been created, but that
> solution may not be suitable for merge.
> 
> Bug: 859152
> Change-Id: Ifaf507525729a9a168e821f722aee03e9f6dd8f4
> Reviewed-on: https://chromium-review.googlesource.com/c/1438037
> Reviewed-by: Ben Wells <benwells@chromium.org>
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Commit-Queue: ccameron <ccameron@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#627151}

TBR=benwells@chromium.org,ccameron@chromium.org,dominickn@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 859152
Change-Id: I6460da08a6dfb8f3e68218ecc19216773062458a
Reviewed-on: https://chromium-review.googlesource.com/c/1450216Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628465}