Remove GrContext from SkXfermode::[Aa]sNewEffectOrCoeff() and all subclasses,

src/effects/SkXfermodeImageFilter.cpp

Index: src/effects/SkXfermodeImageFilter.cpp
diff --git a/src/effects/SkXfermodeImageFilter.cpp b/src/effects/SkXfermodeImageFilter.cpp
index 4d30f0031f4f94a3cd8dca170110eb1e957932e3..e8fa0d2787301d0578229dafe173bc7ea80cf6c4 100644
--- a/src/effects/SkXfermodeImageFilter.cpp
+++ b/src/effects/SkXfermodeImageFilter.cpp
@@ -123,7 +123,7 @@ bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
     GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
 
     SkXfermode::Coeff sm, dm;
-    if (!SkXfermode::AsNewEffectOrCoeff(fMode, context, &xferEffect, &sm, &dm, backgroundTex)) {
+    if (!SkXfermode::AsNewEffectOrCoeff(fMode, &xferEffect, &sm, &dm, backgroundTex)) {
         return false;
     }