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This reverts commit ce0157f4.

Reason for revert: This change breaks text input on ARC windows.
Bug: 866784

Original change's description:
> Cleanup IsArcAppWindow() in ArcWindowDelegateImpl.
> 
> Now aura::client::kAppType property is set for an ARC notification
> window. We can use it for check.
> 
> Change-Id: Id27f5ab83492a4c1a517b1350ae1fc30bfbf8fae
> Reviewed-on: https://chromium-review.googlesource.com/1146626
> Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
> Reviewed-by: Yusuke Sato <yusukes@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#577422}

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

Change-Id: I9a58768a0ae0d84d13d9943674ed60954a9b39d5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1148120Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577451}