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In the baseline policy, we restrict setpriority() to
|which| == PRIO_PROCESS and (|who| == 0) || (|who| == current_pid).

This doesn't affect most policies which allow setpriority()
unconditionally but allows baseline unittests to pass on Android.

BUG=398611, 399473
R=mdempsky@chromium.org

Review URL: https://codereview.chromium.org/430363003

Cr-Commit-Position: refs/heads/master@{#294422}