simplify handle-affine: subclass overrides just describe their leaf behavior

src/effects/SkColorFilterImageFilter.cpp

Index: src/effects/SkColorFilterImageFilter.cpp
diff --git a/src/effects/SkColorFilterImageFilter.cpp b/src/effects/SkColorFilterImageFilter.cpp
index 7a2f4cc2abf65374b571980b74ade8eb14895284..8d412cc2f5579967e9d304c443183f5b5855ae7b 100644
--- a/src/effects/SkColorFilterImageFilter.cpp
+++ b/src/effects/SkColorFilterImageFilter.cpp
@@ -126,12 +126,6 @@ bool SkColorFilterImageFilter::onIsColorFilterNode(SkColorFilter** filter) const
     return false;
 }
 
-bool SkColorFilterImageFilter::onCanHandleAffine() const {
-    SkASSERT(1 == this->countInputs());
-    SkImageFilter* input = this->getInput(0);
-    return !input || input->canHandleAffine();
-}
-
 bool SkColorFilterImageFilter::affectsTransparentBlack() const {
     return fColorFilter->affectsTransparentBlack();
 }