Revert "Wide color gamut support and working example."

breaks CPU-backed canvaskit build

This reverts commit 3d52abc846674b339369f2032e0bc8707d326083.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Wide color gamut support and working example.
> 
> Color space arguments accepted at surface creation, paint, gradient, and other call sites.
> Works correctly only when chrome happens to be rendering itself in the same color space
> the canvaskit user has chosen, there's not yet end to end color management of
> canvases supported in browsers.
> 
> readPixels not yet working due to possible chrome bug.
> 
> Change-Id: I3dea5b16c60a3871cd2a54f86716f4a438a90135
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/289733
> Commit-Queue: Nathaniel Nifong <nifong@google.com>
> Reviewed-by: Kevin Lubick <kjlubick@google.com>

TBR=kjlubick@google.com,brianosman@google.com,nifong@google.com

Change-Id: I2e03155c2512eec6730ecccda19df78174146008
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291339
Reviewed-by: Nathaniel Nifong <nifong@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Nathaniel Nifong <nifong@google.com>
10 files changed