[Oilpan] [Reland] Migrate classes under core/fetch to Oilpan heap

Source/core/fetch/MemoryCacheTest.cpp

Index: Source/core/fetch/MemoryCacheTest.cpp
diff --git a/Source/core/fetch/MemoryCacheTest.cpp b/Source/core/fetch/MemoryCacheTest.cpp
index 57e567d0bd02adbd7828f0f688808322f9e3c0b3..83b2cddfb37827ea3f124b4ed2a1343bdc23ce30 100644
--- a/Source/core/fetch/MemoryCacheTest.cpp
+++ b/Source/core/fetch/MemoryCacheTest.cpp
@@ -90,7 +90,7 @@ protected:
         replaceMemoryCacheForTesting(m_globalMemoryCache.release());
     }
 
-    OwnPtrWillBePersistent<MemoryCache> m_globalMemoryCache;
+    Persistent<MemoryCache> m_globalMemoryCache;
 };
 
 // Verifies that setters and getters for cache capacities work correcty.