Remove unused InstCounterClass.

tests/RefCntTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRefCnt.h"
 #include "SkThreadUtils.h"
 #include "SkTypes.h"
 #include "SkWeakRefCnt.h"
 #include "Test.h"
 
-class InstCounterClass {
-public:
-    InstCounterClass() { fCount = gInstCounter++; }
-    InstCounterClass(const InstCounterClass& src) {
-        fCount = src.fCount;
-        gInstCounter += 1;
-    }
-    virtual ~InstCounterClass() { gInstCounter -= 1; }
-
-    static int gInstCounter;
-    int fCount;
-};
-
-int InstCounterClass::gInstCounter;
-
 static void bounce_ref(void* data) {
     SkRefCnt* ref = static_cast<SkRefCnt*>(data);
     for (int i = 0; i < 100000; ++i) {
         ref->ref();
         ref->unref();
     }
 }
 
 static void test_refCnt(skiatest::Reporter* reporter) {
     SkRefCnt* ref = new SkRefCnt();
@@ skipping 56 matching lines @@
 
     REPORTER_ASSERT(reporter, ref->unique());
     REPORTER_ASSERT(reporter, ref->getWeakCnt() == 1);
     ref->unref();
 }
 
 DEF_TEST(RefCnt, reporter) {
     test_refCnt(reporter);
     test_weakRefCnt(reporter);
 }