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These types and methods are no longer used.

Bug: none
Test: Ensure OOM scores of android apps are set correctly.
Change-Id: Ieef435e504c101ebfeea534b7566dbf4b114c9df
Reviewed-on: https://chromium-review.googlesource.com/1093892Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Christopher Morin <cmtm@google.com>
Cr-Commit-Position: refs/heads/master@{#568132}