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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/+/2418577Reviewed-by: Markus Handell <handellm@google.com>
Commit-Queue: Markus Handell <handellm@google.com>
Cr-Commit-Position: refs/heads/master@{#808384}