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The feature has been launched to 100% Stable for over a month [1], so
this CL removes the feature toggle. Besides this, some instances of
base::RepeatingClosure() in profile_sync_service_unittest.cc are
replaced with base::DoNothing().

[1]https://groups.google.com/a/google.com/g/cr-rel-notify/c/_DOaHr_-x10/m/CA_P823xAQAJ
https://groups.google.com/a/google.com/g/cr-rel-notify/c/mOOb_eXMgy4/m/aRpz0POPAAAJ
https://groups.google.com/a/google.com/g/cr-rel-notify/c/bJ323M0Nrr4/m/jVRaVJWIBAAJ
https://groups.google.com/a/google.com/g/cr-rel-notify/c/ad3g3moxG4k/m/n-KJcTuTAAAJ

Bug: 1140447
Change-Id: Ifc72d6a35402d72bb5935a3dbc2d838fb5855bcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489894Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/master@{#834639}