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These are largely replaced by the app list notifier metrics.

Bug: 1165218,1165219
Change-Id: I35652f5a674d9e8b5efdead52a48d65e7c0cf58b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627196Reviewed-by: Rachel Wong <wrong@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Tony Yeoman <tby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843819}