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|childWindowsDidChange| was removed from the delegate, so these methods
are now noops.

Change-Id: I5becdd5797c0adc14a9c2f53d0f78d5ce684ceea
Reviewed-on: https://chromium-review.googlesource.com/1040946Reviewed-by: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555805}