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Further replacement of a content:: enum with a blink::mojom enum for the
Presentation API.  No behavioral changes.

Bug: 817903
Change-Id: I66fc39db2e8f1e2220aa293e81a77b61d1f69c03
Reviewed-on: https://chromium-review.googlesource.com/1015289
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552872}