Use SkNVRefCnt for a couple common types.

include/core/SkPathRef.h

Index: include/core/SkPathRef.h
diff --git a/include/core/SkPathRef.h b/include/core/SkPathRef.h
index 344e705fc3910fd872cbe32b6026f6360e138cea..f84697fc1d35a70606bd9c0cee6a908aa4dbfa60 100644
--- a/include/core/SkPathRef.h
+++ b/include/core/SkPathRef.h
@@ -36,7 +36,7 @@ class SkWBuffer;
  * logical verb or the last verb in memory).
  */
 
-class SK_API SkPathRef : public ::SkRefCnt {
+class SK_API SkPathRef final : public SkNVRefCnt<SkPathRef> {
 public:
     class Editor {
     public:
@@ -243,7 +243,7 @@ public:
      */
     static void Rewind(SkAutoTUnref<SkPathRef>* pathRef);
 
-    virtual ~SkPathRef();
+    ~SkPathRef();
     int countPoints() const { SkDEBUGCODE(this->validate();) return fPointCnt; }
     int countVerbs() const { SkDEBUGCODE(this->validate();) return fVerbCnt; }
     int countWeights() const { SkDEBUGCODE(this->validate();) return fConicWeights.count(); }
@@ -543,7 +543,6 @@ private:
 
     friend class PathRefTest_Private;
     friend class ForceIsRRect_Private; // unit test isRRect
-    typedef SkRefCnt INHERITED;
 };
 
 #endif