Revert of Blink hasn't rolled yet. (patchset #1 id:1 of https://codereview.chromium.org/754133002/)

Reason for revert:
Not thorough enough.

Original issue's description:
> Blink hasn't rolled yet.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/fa14113d0563686af9f7e2d8e041dd7bf538cfa2

TBR=mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/752303002

include/core/SkRefCnt.h

@@ -42,10 +42,10 @@ public:
 #endif
     }
 
-//#ifdef SK_DEBUG
+#ifdef SK_DEBUG
     /** Return the reference count. Use only for debugging. */
     int32_t getRefCnt() const { return fRefCnt; }
-//#endif
+#endif
 
     /** May return true if the caller is the only owner.
      *  Ensures that all previous owner's actions are complete.