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This code is inlined all over the place, however, there's no good
location to put it. Just factoring it out in two places, however,
doesn't really make sense, so don't do it

R=mkwst@chromium.org
BUG=478250

Review URL: https://codereview.chromium.org/1141993002

Cr-Commit-Position: refs/heads/master@{#330308}