Remove GrContext from SkXfermode::[Aa]sNewEffectOrCoeff() and all subclasses,
since it's unused.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/31853003

git-svn-id: http://skia.googlecode.com/svn/trunk@11913 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index a70a0f5..47ddd52 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -436,7 +436,7 @@
 
     SkXfermode* mode = skPaint.getXfermode();
     GrEffectRef* xferEffect = NULL;
-    if (SkXfermode::AsNewEffectOrCoeff(mode, dev->context(), &xferEffect, &sm, &dm)) {
+    if (SkXfermode::AsNewEffectOrCoeff(mode, &xferEffect, &sm, &dm)) {
         if (NULL != xferEffect) {
             grPaint->addColorEffect(xferEffect)->unref();
             sm = SkXfermode::kOne_Coeff;