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These methods were only used by the chrome://discards UI, which can
instead access the LifecycleUnits directly.

Bug: 775644
Change-Id: Iae97a1d6bcf5af1fcd555608ad05e4921ff8e437
Reviewed-on: https://chromium-review.googlesource.com/1057692
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Fadi Meawad <fmeawad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558759}