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This reverts commit 6c5fa707.

Reason for revert: VTConfigUtil.FormatDescriptionBT709 and FormatDescriptionInvalid are failing on mac
https://ci.chromium.org/p/chromium/builders/ci/Mac10.10%20Tests/58972

Original change's description:
> Add media::GetFormatDescriptionColorSpace
>
> This function is nearly identical to media::GetImageBufferColorSpace,
> but instead operates on a CMFormatDescriptionRef.
>
> Add DCHECKs that the behavior of the two functions be the same, that is,
> the kCVImageBuffer-prefixed and  kCMFormatDescription-prefixed
> constants be equal.
>
> Use base::mac::CFCast instead of reinterpret_casts.
>
> The next patch in this sequence will move these two functions over
> to media/base/mac, because it will be accessed in capture.
>
> Bug: 959962
> Change-Id: I8a4d8468abc866a13cb6181cbd49d9ee04288124
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436513
> Commit-Queue: ccameron <ccameron@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811829}

TBR=dalecurtis@chromium.org,ccameron@chromium.org

Change-Id: Iaa57cf20273eb0bcdace23a1ee9e588da15ea733
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 959962
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438551Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811902}