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