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These focus changed calls ultimately trigger javascript events. These
events could potentially run code that would modify the list of items
that the FocusChanged notifiers are notifying, and thus invalidate their
in-use iterators.

Fix this by having these methods iterate over a copy instead of the
member list.

Fixed: 1107815
Change-Id: I03fa08eeadc60736f3a3fae079253dbd3ee26476
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314158Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791261}