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This reverts commit ce37f17d.

Reason for revert: Causes crash, see 903671

Original change's description:
> Fix text input on ARC++ Kiosk apps.
> 
> We changed IsInArcAppWindow() to use the window property,
> aura::client::kAppType, but it's not set for ARC++ Kiosk apps' window.
> It makes text input on ARC++ Kiosk apps stop working.
> This CL adds a temporary workaround for this situation. Ideally,
> IsArcAppWindow() in arc_util.cc should handle windows of ARC++ Kiosk app
> correctly.
> 
> Bug: 891825
> Test: Can type text on Wikipedia kiosk app.
> Change-Id: I594aa5c0730704b9ad922441187297bd707de20a
> Reviewed-on: https://chromium-review.googlesource.com/c/1291289
> Commit-Queue: Yusuke Sato <yusukes@chromium.org>
> Reviewed-by: Yusuke Sato <yusukes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#601631}

TBR=yusukes@chromium.org,yhanada@chromium.org

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

Bug: 891825
Change-Id: Ic50a4bac3af3dfb7f8fd335bb669d3e620a4446a
Reviewed-on: https://chromium-review.googlesource.com/c/1330339Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607011}