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This removes these two histograms and the logic related to them:
 Apps.AppListResultLaunchIndexAndQueryLength
 Apps.AppListResultLaunchIsEmptyQuery

Bug: 1160781
Change-Id: Ifcd61df6a40dc6bb910bc7c2a6d27e83a0f84cbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628869Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Thanh Nguyen <thanhdng@chromium.org>
Commit-Queue: Tony Yeoman <tby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844957}