Oilpan: enable appcache + move DocumentLoader to the heap.

Source/core/loader/FrameFetchContextTest.cpp

Index: Source/core/loader/FrameFetchContextTest.cpp
diff --git a/Source/core/loader/FrameFetchContextTest.cpp b/Source/core/loader/FrameFetchContextTest.cpp
index d18df401db0925b019fbfc8cba363ac263c5025c..ca7d684bbd00ccac413e2cec50c767a77b305a16 100644
--- a/Source/core/loader/FrameFetchContextTest.cpp
+++ b/Source/core/loader/FrameFetchContextTest.cpp
@@ -108,7 +108,7 @@ protected:
     OwnPtr<DummyPageHolder> dummyPageHolder;
     // We don't use the DocumentLoader directly in any tests, but need to keep it around as long
     // as the ResourceFetcher and Document live due to indirect usage.
-    RefPtr<DocumentLoader> documentLoader;
+    RefPtrWillBePersistent<DocumentLoader> documentLoader;
     RefPtrWillBePersistent<Document> document;
     FetchContext* fetchContext;
 };
@@ -249,7 +249,7 @@ protected:
     OwnPtr<DummyPageHolder> dummyPageHolder;
     // We don't use the DocumentLoader directly in any tests, but need to keep it around as long
     // as the ResourceFetcher and Document live due to indirect usage.
-    RefPtr<DocumentLoader> documentLoader;
+    RefPtrWillBePersistent<DocumentLoader> documentLoader;
     RefPtrWillBePersistent<Document> document;
     FetchContext* fetchContext;
 };
@@ -309,4 +309,3 @@ TEST_F(FrameFetchContextHintsTest, MonitorAllHints)
 }
 
 } // namespace
-