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When the caption controller feature is initialized, it should create
the UI of the live caption feature. Before this feature, the UI was only
created when the kLiveCaptionEnabled pref changed. Note that SODA should
only be registered when the pref changes.

Bug: 1055150
Change-Id: I5d78520854b1a5ad0d5388724aea236f527a7804
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151893
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Katie Dektar <katie@chromium.org>
Reviewed-by: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#760097}