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This logic was duplicated in 3 places, so consolidate in a new helper
function.

Bug: 1059085
Test: browser_tests, unit_tests
Change-Id: I5101d19f195f7ee9c1157330fa634a5f14b47cc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132332
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Dan S <danan@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756071}