switch colorfilters to sk_sp

src/core/SkColorFilterShader.cpp

Index: src/core/SkColorFilterShader.cpp
diff --git a/src/core/SkColorFilterShader.cpp b/src/core/SkColorFilterShader.cpp
index 2e426a17eded3255f99f12f562cda2b86f510691..ce7774c99c9c6731ba38fe0b767c028c701fb6f0 100644
--- a/src/core/SkColorFilterShader.cpp
+++ b/src/core/SkColorFilterShader.cpp
@@ -25,11 +25,11 @@ SkColorFilterShader::SkColorFilterShader(SkShader* shader, SkColorFilter* filter
 
 SkFlattenable* SkColorFilterShader::CreateProc(SkReadBuffer& buffer) {
     auto shader = buffer.readShader();
-    SkAutoTUnref<SkColorFilter> filter(buffer.readColorFilter());
-    if (!shader || !filter.get()) {
+    auto filter = buffer.readColorFilter();
+    if (!shader || !filter) {
         return nullptr;
     }
-    return new SkColorFilterShader(shader.get(), filter);
+    return new SkColorFilterShader(shader.get(), filter.get());
 }
 
 void SkColorFilterShader::flatten(SkWriteBuffer& buffer) const {