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This uses the args file dropped under //build/args/chromeos/ for the
amd64-generic bot instead of reading the args from an env var set by
simple chrome sdk.

Bug: 812428
Change-Id: I705167bddd80ed18ead543f79270d7afaebc386f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088508
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748764}