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This is the first of a series of CLs to get rid of the notion of
"Instant support" entirely, see
https://bugs.chromium.org/p/chromium/issues/detail?id=627747#c41

BUG=627747

Review-Url: https://codereview.chromium.org/2845303002
Cr-Commit-Position: refs/heads/master@{#467974}