Revert "[svg] Perform colorspace conversions for filter effects"

This reverts commit a0880eda22cc9fb4db7ebc0b86b5b2170f2d93e5.

Reason for revert: visual artifacts in 10-bit color depth (10-10-10-2)

Original change's description:
> [svg] Perform colorspace conversions for filter effects
>
> A filter effect can optionally be specified to operate in either sRGB
> or linearRGB, according to the SVG spec:
>
> https://www.w3.org/TR/SVG11/painting.html#ColorInterpolationProperties
>
> This CL adds any necessary conversion steps (SkColorFilters) while
> constructing the filter DAG. The default filter effect color space is
> linearRGB. We should now be passing the filters-gauss-* W3C tests.
>
> Specific changes:
> - Tag filter effect results with their colorspace when storing them in
>   the filter context map
> - Add an SkColorFolor conversion step as necessary when resolving filter
>   effect inputs
>
> Bug: skia:10841
> Change-Id: Ide12698ea64c4d40f09df93a60718788809086fa
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/353078
> Commit-Queue: Tyler Denniston <tdenniston@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>

TBR=fmalita@chromium.org,tdenniston@google.com

Change-Id: Id4a33c49643039cfb2d2867a1513e8ee1d7b181a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:10841
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/353630
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
7 files changed