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

cc/blimp/picture_data_conversions_unittest.cc

Index: cc/blimp/picture_data_conversions_unittest.cc
diff --git a/cc/blimp/picture_data_conversions_unittest.cc b/cc/blimp/picture_data_conversions_unittest.cc
index 535b312fb16643bd3b747a0fecdf8afdc2a5e2ad..f3e64db53843b860ff47c6b2b654b2ecb75c31e2 100644
--- a/cc/blimp/picture_data_conversions_unittest.cc
+++ b/cc/blimp/picture_data_conversions_unittest.cc
@@ -23,7 +23,9 @@
 namespace {
 sk_sp<const SkPicture> CreateSkPicture(SkColor color) {
   SkPictureRecorder recorder;
-  recorder.beginRecording(SkRect::MakeWH(1, 1))->drawColor(color);
+  sk_sp<SkCanvas> canvas =
+      sk_ref_sp(recorder.beginRecording(SkRect::MakeWH(1, 1)));
+  canvas->drawColor(color);
   return recorder.finishRecordingAsPicture();
 }