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This CL removes the -closeAllIncognitoTabs command as it is not used.

Bug: 902781
Change-Id: I583e53095fcddf03c899d6b44779b38daced32a3
Reviewed-on: https://chromium-review.googlesource.com/c/1323670Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606387}