switch surface to sk_sp

src/core/SkPictureImageGenerator.cpp

Index: src/core/SkPictureImageGenerator.cpp
diff --git a/src/core/SkPictureImageGenerator.cpp b/src/core/SkPictureImageGenerator.cpp
index f90ac0f1eea5c8072587ffcbcf4c2486810a6276..6f4ffa1f5bb98dc2ab553d0db0cc85011d493646 100644
--- a/src/core/SkPictureImageGenerator.cpp
+++ b/src/core/SkPictureImageGenerator.cpp
@@ -139,9 +139,8 @@ GrTexture* SkPictureImageGenerator::onGenerateTexture(GrContext* ctx, const SkIR
     //
     // TODO: respect the usage, by possibly creating a different (pow2) surface
     //
-    SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx, SkBudgeted::kYes,
-                                                               surfaceInfo));
-    if (!surface.get()) {
+    sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kYes, surfaceInfo));
+    if (!surface) {
         return nullptr;
     }