Clean up SpeechRecognitionManagerImpl session ownership.

No change in functionality intended.

BUG=390749

Change-Id: I41fa9d774cdd80a46b5c32268e105f88a2663677
Reviewed-on: https://chromium-review.googlesource.com/912530
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536371}
2 files changed