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This reverts commit 1e32efc6.

Reason for revert:
Some tests used to fail in WebRTC Chromium Mac Tester bot.
Since macOS now supports detecting PTZ-capable cameras with this patch,
it is no longer correct to assume that pan_tilt_zoom_supported() will be
false for every enumerated camera, so let's remove the test named
VideoCaptureDeviceFactoryMacTest.ListDevicesWithNoPanTiltZoomSupport


Original change's description:
> Revert "[PTZ] Add macOS support"
>
> This reverts commit 6fc7c32c.
>
> Reason for revert: crbug.com/1128470
>
> Original change's description:
> > [PTZ] Add macOS support
> >
> > This CL makes sure a USB Webcam device on macOS properly advertises its
> > PTZ support. When supported, the pan, tilt, and zoom controls (ranges
> > and values) are available to websites that user has granted access to.
> >
> > Bug: 934063
> > Change-Id: I9d92d41fba0a6e9d518efb2501355d66cf77998f
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368596
> > Reviewed-by: François Beaufort <beaufort.francois@gmail.com>
> > Reviewed-by: Guido Urdaneta <guidou@chromium.org>
> > Reviewed-by: Reilly Grant <reillyg@chromium.org>
> > Reviewed-by: Avi Drissman <avi@chromium.org>
> > Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
> > Cr-Commit-Position: refs/heads/master@{#807387}
>
> TBR=avi@chromium.org,beaufort.francois@gmail.com,reillyg@chromium.org,guidou@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 934063
> Change-Id: I88b1a41d28f5ad34f149f489b22eae6753e051dd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418577
> Reviewed-by: Markus Handell <handellm@google.com>
> Commit-Queue: Markus Handell <handellm@google.com>
> Cr-Commit-Position: refs/heads/master@{#808384}

TBR=avi@chromium.org,beaufort.francois@gmail.com,reillyg@chromium.org,guidou@chromium.org,handellm@google.com

# Not skipping CQ checks because this is a reland.

Bug: 934063
Change-Id: I82b757e1b5d3e6e62f520982ac5e4ef216849550
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2420031Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Markus Handell <handellm@google.com>
Reviewed-by: François Beaufort <beaufort.francois@gmail.com>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#809727}