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It is no longer true that presenting_ will always be false when
PresentOverlayForActiveRequest is called. This can occur if the
current active request is dismissed by being removed from the queue
and adds another overlay in its completion callback. Instead, the
DCHECK can be moved after the OverlayPresentationContext checks,
which should be enough to early return when an overlay is already
being presented.

Bug: 1114547
Change-Id: I1756df163dfb10e96537449491d0cfc5295c4aed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360376
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799195}