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

Source/core/animation/AnimationTimelineTest.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 91 matching lines @@
         element.release();
         timeline.release();
     }
 
     void updateClockAndService(double time)
     {
         document->animationClock().updateTime(time);
         timeline->serviceAnimations(TimingUpdateForAnimationFrame);
     }
 
-    RefPtr<Document> document;
+    RefPtrWillBePersistent<Document> document;
     RefPtrWillBePersistent<Element> element;
     RefPtrWillBePersistent<AnimationTimeline> timeline;
     Timing timing;
     MockPlatformTiming* platformTiming;
 
     void wake()
     {
         timeline->wake();
     }
 
@@ skipping 161 matching lines @@
 
 TEST_F(AnimationAnimationTimelineTest, UseAnimationPlayerAfterTimelineDeref)
 {
     RefPtrWillBeRawPtr<AnimationPlayer> player = timeline->createAnimationPlayer(0);
     timeline.clear();
     // Test passes if this does not crash.
     player->setStartTime(0);
 }
 
 }