stop using SkBitmap::Config

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 11a79dbe7dc3f6ef23015a921d80ea39ae65b8de..72b07379f259b8727bebb8487ac39ef06850aba1 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1376,7 +1376,7 @@ void SkGpuDevice::internalDrawBitmap(const SkBitmap& bitmap,
     // the rest from the SkPaint.
     GrPaint grPaint;
     grPaint.addColorEffect(effect);
-    bool alphaOnly = !(SkBitmap::kA8_Config == bitmap.config());
+    bool alphaOnly = !(kAlpha_8_SkColorType == bitmap.colorType());
     GrColor grColor = (alphaOnly) ? SkColor2GrColorJustAlpha(paint.getColor()) :
                                     SkColor2GrColor(paint.getColor());
     SkPaint2GrPaintNoShader(this->context(), paint, grColor, false, &grPaint);