remove 565 effects shaders

src/effects/gradients/SkGradientShader.cpp

Index: src/effects/gradients/SkGradientShader.cpp
diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index 8155b1cc61ae7876749a31202a0a5e26e009fe14..ac70bc25e1126fdd8cd618dba62e50176c86f9dd 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -314,11 +314,6 @@ SkGradientShaderBase::GradientShaderBaseContext::GradientShaderBaseContext(
     if (shader.fColorsAreOpaque && paintAlpha == 0xFF) {
         fFlags |= kOpaqueAlpha_Flag;
     }
-    // we can do span16 as long as our individual colors are opaque,
-    // regardless of the paint's alpha
-    if (shader.fColorsAreOpaque) {
-        fFlags |= kHasSpan16_Flag;
-    }
 }
 
 SkGradientShaderBase::GradientShaderCache::GradientShaderCache(