use colortype instead of config

src/effects/SkMatrixConvolutionImageFilter.cpp

Index: src/effects/SkMatrixConvolutionImageFilter.cpp
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index f6bc6a1f1f47c30db1a0093cfc40ce4d829e20bf..8ae837755fe9c8924c07313d1694732ab454fcfd 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -238,9 +238,7 @@ static SkBitmap unpremultiplyBitmap(const SkBitmap& src)
         return SkBitmap();
     }
     SkBitmap result;
-    result.setConfig(src.config(), src.width(), src.height());
-    result.allocPixels();
-    if (!result.getPixels()) {
+    if (!result.allocPixels(src.info())) {
         return SkBitmap();
     }
     for (int y = 0; y < src.height(); ++y) {