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The feature toggle was enabled by default in M83 and now it is a good
time to clean it up with related code.

Bug: 1114738
Change-Id: I87a7cb9464a0802a219527e3958e6b33a9708f0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346307Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#796758}