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This CL converts SpeechRecognizerPtr in blink and
SpeechRecognizerRequest in content to the new Mojo types.

Bug: 955171, 978694
Change-Id: I651a16c2d5982eb5a9f4004fa5b09d8be829ddd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775683Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#691923}