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At this point it's only used in tests, to test itself.
Also remove Resource::usage, which isn't used for anything anymore.

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I3b75bba09565d52a126c0f27c344d94ed50fc4c6
Reviewed-on: https://chromium-review.googlesource.com/1014274Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551212}