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Prerendering causes creation of additional RenderProcessHostImpl
objects, which hold it's own blink instance. In single-process mode this
causes blink to be initialized multiple times, which in turn triggers a
DCHECK "FATAL:platform.cc(180)] Check failed: !did_initialize_blink_."

This change disables prerendering in single-process mode.

Test: load http://jmajnert.github.io/tests/prerender_landing.html in
      debug single-process build

Bug: 1151372
Change-Id: I23992afbf681089b4b25e084eeccf470484b2320
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550560Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830249}