Replace many skia::RefPtr with sk_sp<> in cc/

cc/test/skia_common.cc

Index: cc/test/skia_common.cc
diff --git a/cc/test/skia_common.cc b/cc/test/skia_common.cc
index ca9933579a29385bcc0a6624251a3cb1e7bae0c0..e308b6ba0a510d0882b91336cb1b1e9e16ab052f 100644
--- a/cc/test/skia_common.cc
+++ b/cc/test/skia_common.cc
@@ -52,11 +52,10 @@ bool AreDisplayListDrawingResultsSame(const gfx::Rect& layer_rect,
   return !memcmp(pixels_a.get(), pixels_b.get(), pixel_size);
 }
 
-skia::RefPtr<SkImage> CreateDiscardableImage(const gfx::Size& size) {
+sk_sp<SkImage> CreateDiscardableImage(const gfx::Size& size) {
   const SkImageInfo info =
       SkImageInfo::MakeN32Premul(size.width(), size.height());
-  return skia::AdoptRef(
-      SkImage::NewFromGenerator(new TestImageGenerator(info)));
+  return SkImage::MakeFromGenerator(new TestImageGenerator(info));
 }
 
 }  // namespace cc