Oilpan: add [WillBeGarbageCollected] for Node.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 1e7fd644565bfff8ac2874d9af790e54f5136c9f..771a465bce4c97303da5c8dbae2cc000f20a28ed 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -927,13 +927,13 @@ bool Document::importContainerNodeChildren(ContainerNode* oldContainerNode, Pass
     return true;
 }
 
-PassRefPtr<Node> Document::importNode(Node* importedNode, ExceptionState& ec)
+PassRefPtrWillBeRawPtr<Node> Document::importNode(Node* importedNode, ExceptionState& ec)
 {
     UseCounter::countDeprecation(this, UseCounter::DocumentImportNodeOptionalArgument);
     return importNode(importedNode, true, ec);
 }
 
-PassRefPtr<Node> Document::importNode(Node* importedNode, bool deep, ExceptionState& exceptionState)
+PassRefPtrWillBeRawPtr<Node> Document::importNode(Node* importedNode, bool deep, ExceptionState& exceptionState)
 {
     if (!importedNode) {
         exceptionState.throwDOMException(NotSupportedError, ExceptionMessages::argumentNullOrIncorrectType(1, "Node"));
@@ -961,7 +961,7 @@ PassRefPtr<Node> Document::importNode(Node* importedNode, bool deep, ExceptionSt
             exceptionState.throwDOMException(NamespaceError, "The imported node has an invalid namespace.");
             return nullptr;
         }
-        RefPtr<Element> newElement = createElement(oldElement->tagQName(), false);
+        RefPtrWillBeRawPtr<Element> newElement = createElement(oldElement->tagQName(), false);
 
         newElement->cloneDataFromElement(*oldElement);