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Before this patch, we used the chrome custom tab activity instead of the
ChromeActivity base activity.

This will prevent us to introduce Autofill Assistant other flavors than
CCT. This patch reverts to ChromeActivity. The one caveat is that CCT's
finish() does a little more cleanup compared to ChromeActivity, but the
behavior for the cases we tested is the same.

Bug: 806868
Change-Id: I77e99419738f41f0dbaaa5cbb3bb0f64f8c9a37c
Reviewed-on: https://chromium-review.googlesource.com/c/1348114
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610599}