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Clears caption bubble text after the inactivity timeout. Also, prevents
a final transcription received after the bubble has no activity from
setting text. This fixes a bug where the bubble disappeared after
inactivity, and then the speech service sent a final transcription
after several seconds of no audio, which caused the bubble to reappear.

Bug: 1055150
Change-Id: I3a0df495c73df0273e925847671f351b61afcd51
AX-Relnotes: N/A (feature not launched)
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2598622
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Josiah Krutz <josiahk@google.com>
Cr-Commit-Position: refs/heads/master@{#839812}