switch surface to sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1817383002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review URL: https://codereview.chromium.org/1817383002
diff --git a/tests/GpuDrawPathTest.cpp b/tests/GpuDrawPathTest.cpp
index 1f9361a..bab6d3a 100644
--- a/tests/GpuDrawPathTest.cpp
+++ b/tests/GpuDrawPathTest.cpp
@@ -80,9 +80,8 @@
     for (auto& test_func : { &test_drawPathEmpty, &test_drawSameRectOvals }) {
         for (auto& sampleCount : {0, 4, 16}) {
             SkImageInfo info = SkImageInfo::MakeN32Premul(255, 255);
-            SkAutoTUnref<SkSurface> surface(
-                SkSurface::NewRenderTarget(context, SkBudgeted::kNo, info,
-                                           sampleCount, nullptr));
+            auto surface(
+                SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info, sampleCount, nullptr));
             if (!surface) {
                 continue;
             }