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And replaces it with a boolean. This makes more sense as EMBED_IN_OWNER is
really something that changes depending upon whether the Window has an embedding
or not.

BUG=834487
TEST=covered by tests

Change-Id: If5d46331b1c54e329247996f3fc012448435aabf
Reviewed-on: https://chromium-review.googlesource.com/1239371
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595861}