switch surface to sk_sp

tests/SkResourceCacheTest.cpp

Index: tests/SkResourceCacheTest.cpp
diff --git a/tests/SkResourceCacheTest.cpp b/tests/SkResourceCacheTest.cpp
index 7ae5f6486f8be6138c5595d3034b99d5ce16f4c8..3c0d1ffee3a467d00c6e35545a3ed1b003c73942 100644
--- a/tests/SkResourceCacheTest.cpp
+++ b/tests/SkResourceCacheTest.cpp
@@ -264,7 +264,7 @@ DEF_TEST(BitmapCache_discarded_bitmap, reporter) {
 
 static void test_discarded_image(skiatest::Reporter* reporter, const SkMatrix& transform,
                                  sk_sp<SkImage> (*buildImage)()) {
-    SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(10, 10));
+    auto surface(SkSurface::MakeRasterN32Premul(10, 10));
     SkCanvas* canvas = surface->getCanvas();
 
     // SkBitmapCache is global, so other threads could be evicting our bitmaps.  Loop a few times
@@ -313,7 +313,7 @@ DEF_TEST(BitmapCache_discarded_image, reporter) {
 
     for (size_t i = 0; i < SK_ARRAY_COUNT(xforms); ++i) {
         test_discarded_image(reporter, xforms[i], []() {
-            SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(10, 10));
+            auto surface(SkSurface::MakeRasterN32Premul(10, 10));
             surface->getCanvas()->clear(SK_ColorCYAN);
             return surface->makeImageSnapshot();
         });