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It is mostly unused, there is only one constant in that header file,
which is "used" at content/public/common/content_descriptors.h. But
let's just use 0 there, and remove this header file now.

BUG=None

TBR=bradnelson@chromium.org,isherman@chromium.org

Change-Id: Ibb768b429f79693f5b85f0ea47d037cf954badfd
Reviewed-on: https://chromium-review.googlesource.com/520942
Commit-Queue: Thiago Farina <tfarina@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476486}