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This reverts commit 54171d06.

Reason for revert: crbug/1067636 CrostiniUpgraderDialogBrowserTest.ShowsOnAppLaunch failed on linux-chromeos-chrome

Original change's description:
> First browser tests for upgrader dialog
> 
> These tests cover the correct behavior on app launch.
> 
> Bug: 1024693
> Change-Id: I9808e7492e696f8fea89bf5c7eba49439c9fc5aa
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135091
> Commit-Queue: Nicholas Verne <nverne@chromium.org>
> Reviewed-by: Nic Hollingum <hollingum@google.com>
> Cr-Commit-Position: refs/heads/master@{#756193}

TBR=nverne@chromium.org,hollingum@google.com

Change-Id: I520ae534296f744c59f29aca7cbdaada5dc94327
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1024693
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135871Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756282}