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This CL renames AssignToDesksMenu to MoveToDesksMenu. It also updates
comments related to this. Additionally, this CL also updates the command
ids and strings related to this menu.

Test: manual
Bug: 1166856
Change-Id: I24813b042e674031f3c09b74f4aaa5967df77aba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630769Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844306}