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

Source/core/html/shadow/TextFieldDecorationElement.h

Index: Source/core/html/shadow/TextFieldDecorationElement.h
diff --git a/Source/core/html/shadow/TextFieldDecorationElement.h b/Source/core/html/shadow/TextFieldDecorationElement.h
index 228f2e20ae848fbabd1786164888efde20fbf958..8ac9d39b0ac4511d0881d842360d834f24d40125 100644
--- a/Source/core/html/shadow/TextFieldDecorationElement.h
+++ b/Source/core/html/shadow/TextFieldDecorationElement.h
@@ -45,7 +45,7 @@ class TextFieldDecorator {
 public:
     // Returns true if this TextFieldDecorator wants to add a
     // decoration to the specified text field.
-    virtual bool willAddDecorationTo(HTMLInputElement*) = 0;
+    virtual bool willAddDecorationTo(Handle<HTMLInputElement>) = 0;
     virtual bool visibleByDefault() = 0;
 
     // A TextFieldDecorator object should own the CachedImage objects.
@@ -54,11 +54,11 @@ public:
     virtual CachedImage* imageForReadonlyState() = 0;
     virtual CachedImage* imageForHoverState() = 0;
 
-    virtual void handleClick(HTMLInputElement*) = 0;
+    virtual void handleClick(Handle<HTMLInputElement>) = 0;
     // This function is called just before detaching the decoration. It must not
     // call functions which updating state of the specified HTMLInputElement
     // object.
-    virtual void willDetach(HTMLInputElement*) = 0;
+    virtual void willDetach(Handle<HTMLInputElement>) = 0;
 
     virtual ~TextFieldDecorator();
 };
@@ -70,7 +70,7 @@ public:
     static PassRefPtr<TextFieldDecorationElement> create(Document*, TextFieldDecorator*);
     static TextFieldDecorationElement* fromShadowRoot(ShadowRoot*);
     TextFieldDecorator* textFieldDecorator() { return m_textFieldDecorator; }
-    void decorate(HTMLInputElement*, bool visible);
+    void decorate(Handle<HTMLInputElement>, bool visible);
 
     virtual bool willRespondToMouseMoveEvents() OVERRIDE;
     virtual bool willRespondToMouseClickEvents() OVERRIDE;
@@ -85,7 +85,7 @@ private:
     virtual bool isMouseFocusable() const OVERRIDE;
     virtual void defaultEventHandler(Event*) OVERRIDE;
 
-    HTMLInputElement* hostInput();
+    Result<HTMLInputElement> hostInput();
     void updateImage();
 
     TextFieldDecorator* m_textFieldDecorator;