switch colorfilters to sk_sp

gm/coloremoji.cpp

Index: gm/coloremoji.cpp
diff --git a/gm/coloremoji.cpp b/gm/coloremoji.cpp
index 78c347c079655442cafa65903fd6656fb24b5773..4be8202d1932fc3bf7c82444bef21a752db6e943 100644
--- a/gm/coloremoji.cpp
+++ b/gm/coloremoji.cpp
@@ -34,8 +34,8 @@ static SkImageFilter* make_grayscale(SkImageFilter* input = nullptr) {
     matrix[1] = matrix[6] = matrix[11] = 0.7152f;
     matrix[2] = matrix[7] = matrix[12] = 0.0722f;
     matrix[18] = 1.0f;
-    SkAutoTUnref<SkColorFilter> filter(SkColorMatrixFilter::Create(matrix));
-    return SkColorFilterImageFilter::Create(filter, input);
+    auto filter(SkColorFilter::MakeMatrixFilterRowMajor255(matrix));
+    return SkColorFilterImageFilter::Create(filter.get(), input);
 }
 
 static SkImageFilter* make_blur(float amount, SkImageFilter* input = nullptr) {