Even more win64 warning fixes

tests/ImageCacheTest.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 "SkDiscardableMemory.h"
 #include "SkResourceCache.h"
 #include "Test.h"
@@ skipping 38 matching lines @@
         REPORTER_ASSERT(reporter, -1 == value);
 
         cache.add(SkNEW_ARGS(TestingRec, (key, i)));
 
         REPORTER_ASSERT(reporter, cache.find(key, TestingRec::Visitor, &value));
         REPORTER_ASSERT(reporter, i == value);
     }
 
     if (testPurge) {
         // stress test, should trigger purges
-        for (size_t i = 0; i < COUNT * 100; ++i) {
+        for (int i = 0; i < COUNT * 100; ++i) {
             TestingKey key(i);
             cache.add(SkNEW_ARGS(TestingRec, (key, i)));
         }
     }
 
     // test the originals after all that purging
     for (int i = 0; i < COUNT; ++i) {
         intptr_t value;
         (void)cache.find(TestingKey(i), TestingRec::Visitor, &value);
     }
@@ skipping 36 matching lines @@
     TestingKey key(1);
 
     cache.add(SkNEW_ARGS(TestingRec, (key, 2)));
     cache.add(SkNEW_ARGS(TestingRec, (key, 3)));
 
     // Lookup can return either value.
     intptr_t value = -1;
     REPORTER_ASSERT(r, cache.find(key, TestingRec::Visitor, &value));
     REPORTER_ASSERT(r, 2 == value || 3 == value);
 }