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Existing feature implementation has been stable for a long time and
probably no longer needs a kill switch. We can reuse the flag for
upcoming experimentation but removing completely in this CL as the
flag will be re-defined in the same file as all other Assistant
feature flags.

Bug: b:148219866
Change-Id: If8e3bca7f141b06c822ae4a8d75bb940c4c37b8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017666Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#734603}