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This continues the cleanup of the Presentation API typemaps by removing two more
content:: types and replacing them with blink::mojo types defined in
presentation.mojom.

Some refactoring of code and tests was required as Mojo callbacks converted from
base::Optional to blink::mojom::PresentationErrorPtr, which is move-only.


Bug: 817903
Change-Id: I46136114a4afa4c14d989f2fbac341ccffe56740
Reviewed-on: https://chromium-review.googlesource.com/1012984Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551103}