return pictures as sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1811703002

Review URL: https://codereview.chromium.org/1811703002
diff --git a/tests/ImageTest.cpp b/tests/ImageTest.cpp
index 4781aea..ce3cb99 100644
--- a/tests/ImageTest.cpp
+++ b/tests/ImageTest.cpp
@@ -111,8 +111,8 @@
     SkPictureRecorder recorder;
     SkCanvas* canvas = recorder.beginRecording(10, 10);
     canvas->clear(SK_ColorCYAN);
-    sk_sp<SkPicture> picture(recorder.endRecording());
-    return SkImage::MakeFromPicture(picture, SkISize::Make(10, 10), nullptr, nullptr);
+    return SkImage::MakeFromPicture(recorder.finishRecordingAsPicture(), SkISize::Make(10, 10),
+                                    nullptr, nullptr);
 };
 #endif
 // Want to ensure that our Release is called when the owning image is destroyed
@@ -232,7 +232,7 @@
     SkPictureRecorder recorder;
     SkCanvas* canvas = recorder.beginRecording(100, 100);
     canvas->drawImage(image, 0, 0);
-    SkAutoTUnref<SkPicture> picture(recorder.endRecording());
+    sk_sp<SkPicture> picture(recorder.finishRecordingAsPicture());
     REPORTER_ASSERT(reporter, picture);
     REPORTER_ASSERT(reporter, picture->approximateOpCount() > 0);
 
@@ -247,7 +247,7 @@
         REPORTER_ASSERT(reporter, serializers[i]->didEncode());
 
         SkAutoTDelete<SkStream> rstream(wstream.detachAsStream());
-        SkAutoTUnref<SkPicture> deserialized(SkPicture::CreateFromStream(rstream));
+        sk_sp<SkPicture> deserialized(SkPicture::MakeFromStream(rstream));
         REPORTER_ASSERT(reporter, deserialized);
         REPORTER_ASSERT(reporter, deserialized->approximateOpCount() > 0);
     }