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When AudioCapturerMac starts the audio queue, macOS would not show the
prompt asking for microphone permission for the host unless
NSMicrophoneUsageDescription is set on Info.Plist. Without it
AudioCapturerMac capatures nothing but silence. This CL sets the missing
key.

Bug: 1161363
Change-Id: I5e0a57a42b8276439a68cf0647199094ff7c8eec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628890
Auto-Submit: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843548}