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First patch just removes the flag and the command line, the second removes all
the associated code.

Change-Id: Iad8fd182655dca68be28f00c8a55e200dd7557f8
Reviewed-on: https://chromium-review.googlesource.com/598234Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491397}