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The closing-last-incognito-tab experiment has been default-on for nearly a year.

This CL deletes the flag.

Bug: 893314
Change-Id: Iafb145e66c8279cca034c04238b7dc3dca1f92f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807247Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697591}