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

Source/core/html/HTMLInputElement.h

Index: Source/core/html/HTMLInputElement.h
diff --git a/Source/core/html/HTMLInputElement.h b/Source/core/html/HTMLInputElement.h
index 7adc4401b8b65b928e99e790e1782af7478a3499..14ea7d59ec66b02db3f40f7c237a1dfb3877e47e 100644
--- a/Source/core/html/HTMLInputElement.h
+++ b/Source/core/html/HTMLInputElement.h
@@ -45,12 +45,12 @@ struct DateTimeChooserParameters;
 
 class HTMLInputElement : public HTMLTextFormControlElement {
 public:
-    static PassRefPtr<HTMLInputElement> create(const QualifiedName&, Document*, HTMLFormElement*, bool createdByParser);
+    static Result<HTMLInputElement> create(const QualifiedName&, Document*, HTMLFormElement*, bool createdByParser);
     virtual ~HTMLInputElement();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitspeechchange);
 
-    virtual HTMLInputElement* toInputElement() { return this; }
+    virtual Result<HTMLInputElement> toInputElement() { return Handle<HTMLInputElement>(this); }
 
     virtual bool shouldAutocomplete() const;
 
@@ -205,7 +205,6 @@ public:
 
     Vector<String> acceptMIMETypes();
     Vector<String> acceptFileExtensions();
-    String accept() const;

[haraken, 2013/07/17 14:10:23]

This conflicts with our accept(). However, fortunately, this accept() is unused,
so we can just remove it.

[Vyacheslav Egorov (Google), 2013/07/18 16:50:08]

Nice! With this removed we might be even able to rename acceptHeapVisitor into
accept later.

     String alt() const;
 
     void setSize(unsigned);
@@ -248,7 +247,7 @@ public:
     void listAttributeTargetChanged();
 #endif
 
-    HTMLInputElement* checkedRadioButtonForGroup() const;
+    Result<HTMLInputElement> checkedRadioButtonForGroup() const;
     bool isInRequiredRadioButtonGroup();
 
     // Functions for InputType classes.
@@ -298,6 +297,8 @@ public:
     bool setupDateTimeChooserParameters(DateTimeChooserParameters&);
     virtual void reportMemoryUsage(MemoryObjectInfo*) const OVERRIDE;
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 protected:
     HTMLInputElement(const QualifiedName&, Document*, HTMLFormElement*, bool createdByParser);