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No one likes the current confirmation dialog. Begin experimentation
without one.

This CL puts in a new flag that can swap on and off the confirm dialog.
The flag is set up so that there is NO confirm dialog by default.
This is the same as how the NTP version: ConfirmNtpSuggestionRemovals.

Bug: 1016514, 929477, 1205
Change-Id: If158e10da3fbdccc847aafe5221fad57c5c3639b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872182
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708304}