Revert of Change call-sites now that SkCanvas is not ref-counted

blimp/test/support/compositor/picture_cache_test_support.cc

Index: blimp/test/support/compositor/picture_cache_test_support.cc
diff --git a/blimp/test/support/compositor/picture_cache_test_support.cc b/blimp/test/support/compositor/picture_cache_test_support.cc
index 58cd52fd293320c7843736d81c8fa7a2b245cd5d..1f2b35c8b4a6614c094dbeaf6675a68a8b19974f 100644
--- a/blimp/test/support/compositor/picture_cache_test_support.cc
+++ b/blimp/test/support/compositor/picture_cache_test_support.cc
@@ -22,7 +22,8 @@
 
 sk_sp<const SkPicture> CreateSkPicture(SkColor color) {
   SkPictureRecorder recorder;
-  SkCanvas* canvas = recorder.beginRecording(SkRect::MakeWH(1, 1));
+  sk_sp<SkCanvas> canvas =
+      sk_ref_sp(recorder.beginRecording(SkRect::MakeWH(1, 1)));
   canvas->drawColor(color);
   return recorder.finishRecordingAsPicture();
 }