remove SkInstCnt

include/core/SkWeakRefCnt.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkWeakRefCnt_DEFINED
 #define SkWeakRefCnt_DEFINED
 
@@ skipping 33 matching lines @@
     if (myRef.try_ref()) {
         ... // use myRef
         myRef.unref();
     } else {
         // myRef is in the disposed state
     }
     myRef.weak_unref();
 */
 class SK_API SkWeakRefCnt : public SkRefCnt {
 public:
-    SK_DECLARE_INST_COUNT(SkWeakRefCnt)
-
     /** Default construct, initializing the reference counts to 1.
         The strong references collectively hold one weak reference. When the
         strong reference count goes to zero, the collectively held weak
         reference is released.
     */
     SkWeakRefCnt() : SkRefCnt(), fWeakCnt(1) {}
 
     /** Destruct, asserting that the weak reference count is 1.
     */
     virtual ~SkWeakRefCnt() {
@@ skipping 86 matching lines @@
         weak_unref();
     }
 
     /* Invariant: fWeakCnt = #weak + (fRefCnt > 0 ? 1 : 0) */
     mutable int32_t fWeakCnt;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif