Make GrResourceCache2 responsible for calling release, abandon, and ~.

tests/ResourceCacheTest.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.
  */
 
 #if SK_SUPPORT_GPU
 
 #include "GrContext.h"
@@ skipping 68 matching lines @@
         , fToDelete(NULL)
         , fSize(kDefaultSize) {
         this->setScratchKey(scratchKey);
         ++fNumAlive;
         this->registerWithCache();
     }
 
     ~TestResource() {
         --fNumAlive;
         SkSafeUnref(fToDelete);
-        this->release();
     }
 
     void setSize(size_t size) {
         fSize = size;
         this->didChangeGpuMemorySize();
     }
 
     static int NumAlive() { return fNumAlive; }
 
     void setUnrefWhenDestroyed(TestResource* resource) {
@@ skipping 393 matching lines @@
     // The below tests create their own mock contexts.
     test_no_key(reporter);
     test_duplicate_content_key(reporter);
     test_duplicate_scratch_key(reporter);
     test_purge_invalidated(reporter);
     test_cache_chained_purge(reporter);
     test_resource_size_changed(reporter);
 }
 
 #endif