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

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 298c602884fe7b76f02d5a09127feda70e1e4d00..1311a31a56f41844785cc68596acc8948467e56f 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -2645,7 +2645,7 @@ bool Document::dispatchBeforeUnloadEvent(Chrome& chrome, bool& didAllowNavigatio
     if (!body())
         return true;
 
-    RefPtr<Document> protect(this);
+    RefPtrWillBeRawPtr<Document> protect(this);
 
     RefPtrWillBeRawPtr<BeforeUnloadEvent> beforeUnloadEvent = BeforeUnloadEvent::create();
     m_loadEventProgress = BeforeUnloadEventInProgress;
@@ -2671,7 +2671,7 @@ bool Document::dispatchBeforeUnloadEvent(Chrome& chrome, bool& didAllowNavigatio
 
 void Document::dispatchUnloadEvents()
 {
-    RefPtr<Document> protect(this);
+    RefPtrWillBeRawPtr<Document> protect(this);
     if (m_parser)
         m_parser->stopParsing();
 
@@ -4654,7 +4654,7 @@ void Document::finishedParsing()
     // The loader's finishedParsing() method may invoke script that causes this object to
     // be dereferenced (when this document is in an iframe and the onload causes the iframe's src to change).
     // Keep it alive until we are done.
-    RefPtr<Document> protect(this);
+    RefPtrWillBeRawPtr<Document> protect(this);
 
     if (RefPtr<LocalFrame> f = frame()) {
         // Don't update the render tree if we haven't requested the main resource yet to avoid