Oilpan: use transition types for remaining RefPtr<Document>s in dom/.

Source/core/dom/DocumentMarkerControllerTest.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 76 matching lines @@
 {
     document().body()->setInnerHTML(String::fromUTF8(bodyContent), ASSERT_NO_EXCEPTION);
 }
 
 TEST_F(DocumentMarkerControllerTest, DidMoveToNewDocument)
 {
     setBodyInnerHTML("<b><i>foo</i></b>");
     RefPtrWillBeRawPtr<Element> parent = toElement(document().body()->firstChild()->firstChild());
     markNodeContents(parent.get());
     EXPECT_EQ(1u, markerController().markers().size());
-    RefPtr<Document> anotherDocument = Document::create();
+    RefPtrWillBePersistent<Document> anotherDocument = Document::create();
     anotherDocument->adoptNode(parent.get(), ASSERT_NO_EXCEPTION);
 
     // No more reference to marked node.
     Heap::collectAllGarbage();
     EXPECT_EQ(0u, markerController().markers().size());
     EXPECT_EQ(0u, anotherDocument->markers().markers().size());
 }
 
 TEST_F(DocumentMarkerControllerTest, NodeWillBeRemovedMarkedByNormalize)
 {
@@ skipping 86 matching lines @@
         markNodeContents(parent);
         EXPECT_EQ(1u, markerController().markers().size());
         setBodyInnerHTML("");
     }
     // No more reference to marked node.
     Heap::collectAllGarbage();
     EXPECT_EQ(0u, markerController().markers().size());
 }
 
 }