Use SkNVRefCnt for a couple common types.

src/core/SkPathRef.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBuffer.h"
 #include "SkOnce.h"
 #include "SkPath.h"
@@ skipping 657 matching lines @@
     return (uint8_t) verb;
 }
 
 uint8_t SkPathRef::Iter::peek() const {
     const uint8_t* next = fVerbs - 1;
     return next <= fVerbStop ? (uint8_t) SkPath::kDone_Verb : *next;
 }
 
 #ifdef SK_DEBUG
 void SkPathRef::validate() const {
-    this->INHERITED::validate();
     SkASSERT(static_cast<ptrdiff_t>(fFreeSpace) >= 0);
     SkASSERT(reinterpret_cast<intptr_t>(fVerbs) - reinterpret_cast<intptr_t>(fPoints) >= 0);
     SkASSERT((nullptr == fPoints) == (nullptr == fVerbs));
     SkASSERT(!(nullptr == fPoints && 0 != fFreeSpace));
     SkASSERT(!(nullptr == fPoints && 0 != fFreeSpace));
     SkASSERT(!(nullptr == fPoints && fPointCnt));
     SkASSERT(!(nullptr == fVerbs && fVerbCnt));
     SkASSERT(this->currSize() ==
                 fFreeSpace + sizeof(SkPoint) * fPointCnt + sizeof(uint8_t) * fVerbCnt);
 
@@ skipping 60 matching lines @@
                 break;
             default:
                 SkDEBUGFAIL("Unknown Verb");
                 break;
         }
     }
     SkASSERT(mask == fSegmentMask);
 #endif // SK_DEBUG_PATH
 }
 #endif