Oilpan: Prepare to support garbage-collected Node in WebNode hierarchy.

public/web/WebElement.h

 /*
  * Copyright (C) 2009 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 71 matching lines @@
         // have been adjusted to include any transformations. This view is
         // also called the Root View in WebKit.
         // This function will update the layout if required.
         BLINK_EXPORT WebRect boundsInViewportSpace();
 
         // Returns the image contents of this element or a null WebImage
         // if there isn't any.
         BLINK_EXPORT WebImage imageContents();
 
 #if BLINK_IMPLEMENTATION
-        WebElement(const WTF::PassRefPtr<WebCore::Element>&);
-        WebElement& operator=(const WTF::PassRefPtr<WebCore::Element>&);
-        operator WTF::PassRefPtr<WebCore::Element>() const;
+        WebElement(const PassRefPtrWillBeRawPtr<WebCore::Element>&);
+        WebElement& operator=(const PassRefPtrWillBeRawPtr<WebCore::Element>&);
+        operator PassRefPtrWillBeRawPtr<WebCore::Element>() const;
 #endif
     };
 
 } // namespace blink
 
 #endif