Reason for revert:
Breaks Chromium FYI bots because of link issue
Original issue's description:
> Don't use VoE legacy APIs in force_mic_volume_max tool.
>
> BUG=webrtc:4690
>
> Committed: https://crrev.com/ae9f2bdcef7f3a338ece6f57744c8c8f74d15483
> Cr-Commit-Position: refs/heads/master@{#14135}
TBR=henrika@webrtc.org,phoglund@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:4690
Review-Url: https://codereview.webrtc.org/2320113002
Cr-Commit-Position: refs/heads/master@{#14137}
But keep #including scoped_ptr.h in .h files, so as not to break
WebRTC users who expect those .h files to give them rtc::scoped_ptr.
BUG=webrtc:5520
Review-Url: https://codereview.webrtc.org/1937693002
Cr-Commit-Position: refs/heads/master@{#12581}