Revert "Revert of setConfig -> setInfo (https://codereview.chromium.org/308683005/)"

src/gpu/GrPictureUtils.cpp

Index: src/gpu/GrPictureUtils.cpp
diff --git a/src/gpu/GrPictureUtils.cpp b/src/gpu/GrPictureUtils.cpp
index 84a13be46629ef70ac482aafd4604dd0c5dc6de4..30a1d39a3c7b59ed4cc37d31d1180b13343b56aa 100644
--- a/src/gpu/GrPictureUtils.cpp
+++ b/src/gpu/GrPictureUtils.cpp
@@ -41,10 +41,7 @@ public:
         fInfo.fHasNestedLayers = false;
         fInfo.fIsNested = (2 == fSaveLayerDepth);
 
-        fEmptyBitmap.setConfig(SkImageInfo::Make(fInfo.fSize.fWidth,
-                                                 fInfo.fSize.fHeight,
-                                                 kUnknown_SkColorType,
-                                                 kIgnore_SkAlphaType));
+        fEmptyBitmap.setInfo(SkImageInfo::MakeUnknown(fInfo.fSize.fWidth, fInfo.fSize.fHeight));
         fAccelData = accelData;
         fAlreadyDrawn = false;
     }