Revert of Add SkRasterPipeline blitter. (patchset #18 id:340001 of https://codereview...

Revert of Add SkRasterPipeline blitter. (patchset #18 id:340001 of https://codereview.chromium.org/2146413002/ )

Reason for revert:
Leaking the blitter

https://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-ASAN/builds/7908/steps/test_skia%20on%20Ubuntu/logs/stdio

Original issue's description:
> Add SkRasterPipeline blitter.
>
> This is now pixel-exact with the existing sRGB SW impl as far as I've tested.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2146413002
> CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
>
> Committed: https://skia.googlesource.com/skia/+/3011e337693a9786f62d8de9ac4b239ad6dbdaca

TBR=reed@google.com,mtklein@chromium.org
# 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/2178523002