Revert "Consolidate SkRasterPipelineBlitter blendmode construction"

This reverts commit 19bf2b3a645c9e4129ee72e26541c4edea708393.

Reason for revert: not going to cover all cases

Original change's description:
> Consolidate SkRasterPipelineBlitter blendmode construction
> 
> Only blitAntiH & blitMask/kA8 for now, but hopefully we can extend for
> blitRect & blitMask/kLCD16 also.
> 
> Change-Id: I5e888d49c0c11f2f1fc595dbfb382044fc224edc
> Reviewed-on: https://skia-review.googlesource.com/37542
> Reviewed-by: Mike Klein <mtklein@google.com>
> Commit-Queue: Florin Malita <fmalita@chromium.org>

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

Change-Id: Ibd007bbc76f1bf8ec34998cc6ccb6b842792034c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/37860
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed