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Checking for the parse histogram is causing flakes for
PrerenderBrowserTest.PageLoadMetricsPrerender. I don't know what's
causing it to flake, but it is definitely hanging in the
ParseStartMetricsWaiter. As (1) prerender is deprecated and being
removed, and (2) this histogram check was a subtle way to verify
prerender behavior and so not necessarily reliable anyway, it seems
most expedient to remove it and keep the bots green.

Bug: 812158
Change-Id: I334a81fd554fdec7eef4567e662194e45fc012fe
Reviewed-on: https://chromium-review.googlesource.com/918664Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536994}