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This change adds a browser test (actually an interactive ui test) that ensures
that flags that expire actually end up hidden in the UI. To avoid depending on
the real flag metadata, this change also adds
flags::testing::SetFlagExpiredPredicate to allow tests to control which flags
are considered to have expired.

Bug: 1010678
Change-Id: If6275735105fa552779429f7978d7bf9e76f3687
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876469Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709011}