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This will allow NoTouchActivity to support things like oauth flows and
not clear history stack when something opens in a new window.

Bug: 959338
Change-Id: I287f8642cc94d4bc8a7578e296cac1f48be8d194
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600961Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658389}