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This CL disables the Live Caption feature if the kLiveCaption feature
flag is disabled. Previously, the Live Caption feature would only be
enabled if the kLiveCaptionEnabled user pref is enabled, which can
only be enabled if the kLiveCaption feature is enabled. The feature
should be completely off if the kLiveCaption feature is disabled,
even if the feature and pref were previously enabled.

Bug: 1121296
Change-Id: I6f642f025d69b411223cc137e999d7980d5d4917
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372734Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#801424}