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

Source/web/WebDocumentType.cpp

Index: Source/web/WebDocumentType.cpp
diff --git a/Source/web/WebDocumentType.cpp b/Source/web/WebDocumentType.cpp
index 243f285dde66ed80fa7a16fc0a8e7cf539403ade..e37b36cabe55452606c3b36821024a193c0e5e31 100644
--- a/Source/web/WebDocumentType.cpp
+++ b/Source/web/WebDocumentType.cpp
@@ -44,18 +44,18 @@ WebString WebDocumentType::name() const
     return WebString(constUnwrap<DocumentType>()->name());
 }
 
-WebDocumentType::WebDocumentType(const PassRefPtr<DocumentType>& elem)
+WebDocumentType::WebDocumentType(const PassRefPtrWillBeRawPtr<DocumentType>& elem)
     : WebNode(elem)
 {
 }
 
-WebDocumentType& WebDocumentType::operator=(const PassRefPtr<DocumentType>& elem)
+WebDocumentType& WebDocumentType::operator=(const PassRefPtrWillBeRawPtr<DocumentType>& elem)
 {
     m_private = elem;
     return *this;
 }
 
-WebDocumentType::operator PassRefPtr<DocumentType>() const
+WebDocumentType::operator PassRefPtrWillBeRawPtr<DocumentType>() const
 {
     return toDocumentType(m_private.get());
 }