MemoryCacheTest: tidy up task's Resource reference.

third_party/WebKit/Source/core/fetch/MemoryCacheTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 215 matching lines @@
             ASSERT_GT(m_live->decodedSize(), 0u);
 
             memoryCache()->prune(); // Dead resources are pruned immediately
             ASSERT_EQ(m_dead->size(), memoryCache()->deadSize());
             ASSERT_EQ(m_live->size(), memoryCache()->liveSize());
             ASSERT_GT(m_live->decodedSize(), 0u);
         }
 
     private:
         ResourcePtr<Resource> m_live;
-        Resource* m_dead;
+        RawPtrWillBePersistent<Resource> m_dead;
     };
 
     class Task2 : public WebTaskRunner::Task {
     public:
         Task2(unsigned liveSizeWithoutDecode)
             : m_liveSizeWithoutDecode(liveSizeWithoutDecode) { }
 
         void run() override
         {
             // Next task: now, the live resource was evicted.
@@ skipping 314 matching lines @@
 
     WillBeHeapVector<RawPtrWillBeMember<Resource>> resources = memoryCache()->resourcesForURL(url);
     EXPECT_EQ(2u, resources.size());
 
     memoryCache()->evictResources();
     EXPECT_FALSE(memoryCache()->contains(resource1.get()));
     EXPECT_FALSE(memoryCache()->contains(resource3.get()));
 }
 
 } // namespace