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Missed a case for part 1 (https://chromium-review.googlesource.com/c/chromium/src/+/797681).
After both snap, press F5 to return to one snap + overview. Snapped
windows header is not shown. This is because on entering overview mode
or switching from split view states happen when overview is starting,
not when it is entered (IsSelecting() returns false in OnOverviewModeStarting),
so remove that check.

Test: manual, ash_unittests CustomFrameViewAshTest.HeaderVisibility
Bug: 789378
Change-Id: I1f1589b359983dcc6a2db65be62cd185121411c0
Reviewed-on: https://chromium-review.googlesource.com/809757Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522344}