Reason for revert:
Internal project has been fixed
Original issue's description:
> Revert of Unify the macOS and iOS capturer implementations (patchset #4 id:60001 of https://codereview.webrtc.org/2309253005/ )
>
> Reason for revert:
> Breaks internal project
>
> Original issue's description:
> > Unify the macOS and iOS capturer implementations
> >
> > This removes the QTKit based capturer for mac, and removes the need
> > to link against deprecated system libraries on macOS.
> >
> > BUG=webrtc:3968,webrtc:6275,webrtc:6333
> >
> > Committed: https://crrev.com/242d8bdddd77109781cbb70c59d161be7566ac98
> > Cr-Commit-Position: refs/heads/master@{#14418}
>
> TBR=magjed@webrtc.org,tkchin@webrtc.org,perkj@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:3968,webrtc:6275,webrtc:6333
>
> Committed: https://crrev.com/eddb7571d81e51a66f4abaf55013c85b4132c837
> Cr-Commit-Position: refs/heads/master@{#14429}
TBR=magjed@webrtc.org,tkchin@webrtc.org,perkj@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:3968,webrtc:6275,webrtc:6333
Review-Url: https://codereview.webrtc.org/2375273004
Cr-Commit-Position: refs/heads/master@{#14451}
20a52e1639