[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/WebKit/chromium/public/WebFormControlElement.h

Index: Source/WebKit/chromium/public/WebFormControlElement.h
diff --git a/Source/WebKit/chromium/public/WebFormControlElement.h b/Source/WebKit/chromium/public/WebFormControlElement.h
index fac295ef782dbb1e1009d0d36215277d2f720ccd..3590276a126f07da769824fbd24fd8f234449507 100644
--- a/Source/WebKit/chromium/public/WebFormControlElement.h
+++ b/Source/WebKit/chromium/public/WebFormControlElement.h
@@ -36,7 +36,10 @@
 #include "WebFormElement.h"
 
 #if WEBKIT_IMPLEMENTATION
-namespace WebCore { class HTMLFormControlElement; }
+namespace WebCore {
+class HTMLFormControlElement;
+template<typename T> class Handle;
+}
 #endif
 
 namespace WebKit {
@@ -69,9 +72,9 @@ public:
     WEBKIT_EXPORT WebFormElement form() const;
 
 #if WEBKIT_IMPLEMENTATION
-    WebFormControlElement(const WTF::PassRefPtr<WebCore::HTMLFormControlElement>&);
-    WebFormControlElement& operator=(const WTF::PassRefPtr<WebCore::HTMLFormControlElement>&);
-    operator WTF::PassRefPtr<WebCore::HTMLFormControlElement>() const;
+    WebFormControlElement(WebCore::Handle<WebCore::HTMLFormControlElement>);
+    WebFormControlElement& operator=(WebCore::Handle<WebCore::HTMLFormControlElement>);
+    operator WebCore::Handle<WebCore::HTMLFormControlElement>() const;
 #endif
 };