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On Mac, uninstall deletes the app data dir altogether.
On Win, uninstall deletes the app's grandparent dir, which contains
the program executable, logs, and prefs file.

Bug: 1115135
Change-Id: Ife281abeafd265b1cd50f6fcb67212b49eccc5ef
Fixed: 1115135
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353192
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798257}