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The CL has the base iOS Chrome unit tests set the plist key for the
UIScene APIs when the gn flags for multiwindow/scene startup are
set.


Change-Id: I278be41b16e26d1078c043f936b3febc65dde6c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199144
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774177}