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

Source/web/WebElement.cpp

Index: Source/web/WebElement.cpp
diff --git a/Source/web/WebElement.cpp b/Source/web/WebElement.cpp
index 31893c7278cd0c61e0cd9fd428a2251f26c21c1f..d80c4e6564a80f711d1320b99726205852fece71 100644
--- a/Source/web/WebElement.cpp
+++ b/Source/web/WebElement.cpp
@@ -172,18 +172,18 @@ WebImage WebElement::imageContents()
     return bitmap->bitmap();
 }
 
-WebElement::WebElement(const PassRefPtr<Element>& elem)
+WebElement::WebElement(const PassRefPtrWillBeRawPtr<Element>& elem)
     : WebNode(elem)
 {
 }
 
-WebElement& WebElement::operator=(const PassRefPtr<Element>& elem)
+WebElement& WebElement::operator=(const PassRefPtrWillBeRawPtr<Element>& elem)
 {
     m_private = elem;
     return *this;
 }
 
-WebElement::operator PassRefPtr<Element>() const
+WebElement::operator PassRefPtrWillBeRawPtr<Element>() const
 {
     return toElement(m_private.get());
 }