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This Cl moves the implementation of the RecentTabsMenuProvider protocol
in a separate helper.
This helper is used to create context menu from the recent tabs and the
tab grid coordinator.

Bug: 1093302
Change-Id: I7c78adc6eded30f749b9a2dec8d159306452588a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351974Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798609}