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This CL converts SpeechRecognitionSessionClient{Ptr, PtrInfo} in
blink and content to the new Mojo type, and uses
pending_remote<SpeechRecognitionSessionClient>
in speech_recognizer.mojom.

Bug: 955171, 978694
Change-Id: Ie6316bc231d269bf95439d30c3952db7cf458e7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809042Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#697470}