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Static analysis will have already run on non-official bots, so
these checks don't need to be run again on official bots. Both
steps are a bit slow, so they are meaningful to disable.

Change-Id: I8d56c0046f88c0746e1e8129721e49b0325419f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880157Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709518}