Oilpan: Replace RefPtrs to Document in core/{accessibility,animation,fetch} with Oilpan transition …

Source/core/animation/AnimationTest.cpp

Index: Source/core/animation/AnimationTest.cpp
diff --git a/Source/core/animation/AnimationTest.cpp b/Source/core/animation/AnimationTest.cpp
index 77a11401b332fbd54d0fe724bacdd2b2b11046cd..4c4cf5278f4689f0ae286d7786fa791a16687ebc 100644
--- a/Source/core/animation/AnimationTest.cpp
+++ b/Source/core/animation/AnimationTest.cpp
@@ -28,7 +28,7 @@ protected:
         EXPECT_EQ(0, document->timeline().currentTime());
     }
 
-    RefPtr<Document> document;
+    RefPtrWillBePersistent<Document> document;
     RefPtrWillBePersistent<Element> element;
     TrackExceptionState exceptionState;
 };