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This is less likely an issue because I'm no aware of an app that can't
be maximized/snapped in chrome (arc will use different code path)
but this is right thing anyway.

Bug: None
Change-Id: Ia7f49fd99000574b9431218b3be873baed9afdd0
Reviewed-on: https://chromium-review.googlesource.com/987542
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547488}