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PrerenderContents are destroyed when they use too much memory. They were
previously using base::ProcessMetrics, which returns inconsistent
results across OSes. This CL changes it to use memory_instrumentation,
which returns consistent metrics across all OSes.

Bug: 819289
Change-Id: I1b459c2b8838c5ed69c07bf37182ca4e164d7fc3
Reviewed-on: https://chromium-review.googlesource.com/966598Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543825}