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We'd like to remove redundant enums from content/ and chrome/ related
to the Presentation API, and the associated typemapping code.

Eventually we will eliminate all the Presentation API typemaps from content/.

This change eliminates one enum from content, others will follow.

Bug: 817903
Change-Id: I944f114886bee6a10348f33a4355262f3feb5901
Reviewed-on: https://chromium-review.googlesource.com/1003772Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550659}