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And tweak README.md build instructions

Bug: None
Change-Id: Ic092e33392d30b27dd3666593c1e0d601b5617c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032804Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737801}