Stop supporting HW dither

src/gpu/GrAtlasTextContext.cpp

Index: src/gpu/GrAtlasTextContext.cpp
diff --git a/src/gpu/GrAtlasTextContext.cpp b/src/gpu/GrAtlasTextContext.cpp
index 822c480ef3fc44ee09aa104ccd50e57fd42b367c..81cc6471f75462853bcec731ebe6f00bac63883f 100644
--- a/src/gpu/GrAtlasTextContext.cpp
+++ b/src/gpu/GrAtlasTextContext.cpp
@@ -389,7 +389,7 @@ void GrAtlasTextContext::drawTextBlob(GrDrawContext* dc, GrRenderTarget* rt,
     // Though for the time being runs in the textblob can override the paint, they only touch font
     // info.
     GrPaint grPaint;
-    if (!SkPaint2GrPaint(fContext, rt, skPaint, viewMatrix, true, &grPaint)) {
+    if (!SkPaint2GrPaint(fContext, skPaint, viewMatrix, true, &grPaint)) {
         return;
     }
 
@@ -2265,7 +2265,7 @@ DRAW_BATCH_TEST_DEFINE(TextBlobBatch) {
     skPaint.setSubpixelText(random->nextBool());
 
     GrPaint grPaint;
-    if (!SkPaint2GrPaint(context, rt, skPaint, viewMatrix, true, &grPaint)) {
+    if (!SkPaint2GrPaint(context, skPaint, viewMatrix, true, &grPaint)) {
         SkFAIL("couldn't convert paint\n");
     }