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Add check to verify that the speech recognition service is still active before sending data down the pipe

This CL contains a speculative fix that addresses a crash when calling AudioReceivedAfterBubbleClosed after the caption bubble is closed. I haven't been able to repro this crash and thus have not been able to verify this fix; however, the recognition client shouldn't send data to the speech recognition recognizer if the speech recognition service is destroyed anyways so this fix is of very low risk.

Bug: 1161756
Change-Id: Ied868dfa17966650f79ceb954a6ac694f59e33d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605295Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#839606}