bench, samples, etc: s/SkAutoTUnref/sk_sp/

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4437

Change-Id: Ice071684ac8a99e4bb405b4b9be8e8f42c7bac42
Reviewed-on: https://skia-review.googlesource.com/4437
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index 6722429..75827ff 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -241,7 +241,7 @@
         fActualColorBits = SkTMax(attachmentInfo.fColorBits, 24);
 
         SkASSERT(nullptr == fCurIntf);
-        SkAutoTUnref<const GrGLInterface> glInterface;
+        sk_sp<const GrGLInterface> glInterface;
         switch (win->getDeviceType()) {
             case kRaster_DeviceType:    // fallthrough
             case kGPU_DeviceType: