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This CL obsoletes the following histograms and their corresponding enums
  1. Apps.ShortcutsMenu.Registration.Win.Result
  2. Apps.ShortcutsMenu.Unregistration.Win.Result

These histograms were used to gauge feature health for Shortcuts Menu
on Windows which launched in M85. The feature has remained healthy into
M87. So, we can safely obsolete these histograms and remove the
corresponding instrumentation code from Chromium.

Bug: 1125647,1125648
Change-Id: Ic0fa250aa431562a453ab783f47f10bc129a8444
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632148Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Reviewed-by: Phillis Tang <phillis@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Rahul Singh <rahsin@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#845328}