switch colorfilters to sk_sp

gm/modecolorfilters.cpp

Index: gm/modecolorfilters.cpp
diff --git a/gm/modecolorfilters.cpp b/gm/modecolorfilters.cpp
index de6a18a41c85e2320773743e82ee0d9fa92728b3..4e5d45cf96e5045ee6de71db739c2fc32927d4e7 100644
--- a/gm/modecolorfilters.cpp
+++ b/gm/modecolorfilters.cpp
@@ -121,9 +121,7 @@ protected:
         static const int kRectsPerRow = SkMax32(this->getISize().fWidth / kRectWidth, 1);
         for (size_t cfm = 0; cfm < SK_ARRAY_COUNT(modes); ++cfm) {
             for (size_t cfc = 0; cfc < SK_ARRAY_COUNT(colors); ++cfc) {
-                SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateModeFilter(colors[cfc],
-                                                                               modes[cfm]));
-                paint.setColorFilter(cf);
+                paint.setColorFilter(SkColorFilter::MakeModeFilter(colors[cfc], modes[cfm]));
                 for (size_t s = 0; s < SK_ARRAY_COUNT(shaders); ++s) {
                     paint.setShader(shaders[s]);
                     bool hasShader = nullptr == paint.getShader();