Oilpan: Replace RefPtrs to Node and its subclasses in core/rendering with Oilpan transition types.

Source/core/rendering/FastTextAutosizer.cpp

Index: Source/core/rendering/FastTextAutosizer.cpp
diff --git a/Source/core/rendering/FastTextAutosizer.cpp b/Source/core/rendering/FastTextAutosizer.cpp
index 7b71e46e49c5c60435f1d6e34298d64666c9d55e..97039c667df51feb4e0390daae391468451d2115 100644
--- a/Source/core/rendering/FastTextAutosizer.cpp
+++ b/Source/core/rendering/FastTextAutosizer.cpp
@@ -55,7 +55,7 @@ namespace WebCore {
 #ifdef AUTOSIZING_DOM_DEBUG_INFO
 class WriteDebugInfoTask : public ExecutionContextTask {
 public:
-    WriteDebugInfoTask(PassRefPtr<Element> element, AtomicString value)
+    WriteDebugInfoTask(PassRefPtrWillBeRawPtr<Element> element, AtomicString value)
         : m_element(element)
         , m_value(value)
     {
@@ -67,7 +67,7 @@ public:
     }
 
 private:
-    RefPtr<Element> m_element;
+    RefPtrWillBePersistent<Element> m_element;
     AtomicString m_value;
 };