Revert of Add SkRasterPipeline blitter.

src/core/SkColorFilter.cpp

Index: src/core/SkColorFilter.cpp
diff --git a/src/core/SkColorFilter.cpp b/src/core/SkColorFilter.cpp
index 31c0ddb06b27ba4905fce7f777e11ba3d95ee040..167a6683809732041e598f8e06cf14961a72cc9d 100644
--- a/src/core/SkColorFilter.cpp
+++ b/src/core/SkColorFilter.cpp
@@ -36,14 +36,6 @@
     return nullptr;
 }
 #endif
-
-bool SkColorFilter::appendStages(SkRasterPipeline* pipeline) const {
-    return this->onAppendStages(pipeline);
-}
-
-bool SkColorFilter::onAppendStages(SkRasterPipeline*) const {
-    return false;
-}
 
 void SkColorFilter::filterSpan4f(const SkPM4f src[], int count, SkPM4f result[]) const {
     const int N = 128;