refFoo variant for getters that naturally have a sk_sp

BUG=skia:

Change-Id: I13afa1b81e8a72d93e45fb4d37228be196b0f388
Reviewed-on: https://skia-review.googlesource.com/6923
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 4716053..8bcc421 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -485,7 +485,7 @@
              *      draw onto the previous layer using the xfermode from the original paint.
              */
             SkPaint tmp;
-            tmp.setImageFilter(sk_ref_sp(fPaint->getImageFilter()));
+            tmp.setImageFilter(fPaint->refImageFilter());
             tmp.setBlendMode(fPaint->getBlendMode());
             SkRect storage;
             if (rawBounds) {
@@ -1180,7 +1180,7 @@
         return SkImageInfo::MakeN32(w, h, alphaType);
     } else {
         // keep the same characteristics as the prev
-        return SkImageInfo::Make(w, h, prev.colorType(), alphaType, sk_ref_sp(prev.colorSpace()));
+        return SkImageInfo::Make(w, h, prev.colorType(), alphaType, prev.refColorSpace());
     }
 }