Reland of Unify the macOS and iOS capturer implementations

Reland of Unify the macOS and iOS capturer implementations (patchset #1 id:1 of https://codereview.webrtc.org/2381853002/ )

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
Committed: https://crrev.com/20a52e16398851d00b70c5fb5d7583c3852ab6ab
Cr-Commit-Position: refs/heads/master@{#14451}

[kthelgason, 2016-09-29 09:44:33]

Created Reland of Unify the macOS and iOS capturer implementations

[magjed_webrtc, 2016-09-29 10:56:00]

lgtm

[kthelgason, 2016-09-30 07:42:54]

The CQ bit was checked by kthelgason@webrtc.org

[commit-bot: I haz the power, 2016-09-30 07:43:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-09-30 07:43:14]

Committed patchset #2 (id:150004)

[commit-bot: I haz the power, 2016-09-30 07:43:22]

Description was changed from

==========
Reland of Unify the macOS and iOS capturer implementations (patchset #1 id:1 of
https://codereview.webrtc.org/2381853002/ )

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
==========

to

==========
Reland of Unify the macOS and iOS capturer implementations (patchset #1 id:1 of
https://codereview.webrtc.org/2381853002/ )

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

Committed: https://crrev.com/20a52e16398851d00b70c5fb5d7583c3852ab6ab
Cr-Commit-Position: refs/heads/master@{#14451}
==========

[commit-bot: I haz the power, 2016-09-30 07:43:22]

Patchset 2 (id:??) landed as
https://crrev.com/20a52e16398851d00b70c5fb5d7583c3852ab6ab
Cr-Commit-Position: refs/heads/master@{#14451}