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Additionally minor cleanup of upgrade steps in README.chromium.

This is a follow-up addressing some feedback received in the reviews for
the attached bug.

Bug: 807093
Change-Id: Idd5e4fb196aeac6c101c1773ac6a0c364bb73ec3
Reviewed-on: https://chromium-review.googlesource.com/907868Reviewed-by: Chris Mumford <cmumford@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535900}