Revert of Add specialized sRGB blitter for SkOpts (patchset #21 id:400001 of https...

Revert of Add specialized sRGB blitter for SkOpts (patchset #21 id:400001 of https://codereview.chromium.org/1939513002/ )

Reason for revert:
broke some debug bots:

Running LinearSrcOvericonstrip.pngVSkOptsSSE41	nonrendering
../../../bench/SkBlend_optsBench.cpp:118: fatal error: ""fPixmap.colorType() == kRGBA_8888_SkColorType""

Original issue's description:
> Add tests and benches to support the sRGB blitter for SkOpts
>
>  1,370.85 LinearSrcOvericonstrip.pngVSkOptsSSE41
>  2,359.69 LinearSrcOvericonstrip.pngVSkOptsDefault
>  1,828.72 LinearSrcOvericonstrip.pngVSkOptsNonSimdCore
>  3,277.40 LinearSrcOvericonstrip.pngVSkOptsTrivial
>  9,862.34 LinearSrcOvericonstrip.pngVSkOptsBruteForce
>
>    633.55 LinearSrcOvermandrill_512.pngVSkOptsSSE41
>    684.29 LinearSrcOvermandrill_512.pngVSkOptsDefault
>  1,201.88 LinearSrcOvermandrill_512.pngVSkOptsNonSimdCore
>  2,382.63 LinearSrcOvermandrill_512.pngVSkOptsTrivial
> 10,888.74 LinearSrcOvermandrill_512.pngVSkOptsBruteForce
>
>    209.14 LinearSrcOverplane.pngVSkOptsSSE41
>    562.24 LinearSrcOverplane.pngVSkOptsDefault
>    272.64 LinearSrcOverplane.pngVSkOptsNonSimdCore
>    436.46 LinearSrcOverplane.pngVSkOptsTrivial
>  1,327.23 LinearSrcOverplane.pngVSkOptsBruteForce
>
>    318.01 LinearSrcOverbaby_tux.pngVSkOptsSSE41
>    529.05 LinearSrcOverbaby_tux.pngVSkOptsDefault
>    441.33 LinearSrcOverbaby_tux.pngVSkOptsNonSimdCore
>    720.50 LinearSrcOverbaby_tux.pngVSkOptsTrivial
>  2,191.10 LinearSrcOverbaby_tux.pngVSkOptsBruteForce
>
>    479.68 LinearSrcOveryellow_rose.pngVSkOptsSSE41
>  1,095.03 LinearSrcOveryellow_rose.pngVSkOptsDefault
>    668.60 LinearSrcOveryellow_rose.pngVSkOptsNonSimdCore
>  1,257.19 LinearSrcOveryellow_rose.pngVSkOptsTrivial
>  4,970.25 LinearSrcOveryellow_rose.pngVSkOptsBruteForce
>
>
>
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1939513002
> CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
>
> Committed: https://skia.googlesource.com/skia/+/554784cd85029c05d9ed04b1aeb71520d196153a
>
> Committed: https://skia.googlesource.com/skia/+/bc927548db17accec2195af6e15053f7918bb3f5

TBR=mtklein@google.com,fmalita@chromium.org,herb@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review-Url: https://codereview.chromium.org/1986763002