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We have not supported valgrind for some time (it was never ported to
the GN build IIUC, and has been obsoleted by ASan/MSan/TSan).

BUG=791518

Change-Id: Id24289347d0811ed51a0b9ac036c746ef18bf75f
Reviewed-on: https://chromium-review.googlesource.com/809426Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#522045}