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

Source/core/html/HTMLFormElement.cpp

Index: Source/core/html/HTMLFormElement.cpp
diff --git a/Source/core/html/HTMLFormElement.cpp b/Source/core/html/HTMLFormElement.cpp
index 00a901e6784b2ca6234ba072fdca896d668f120f..39d2e11ab7566468abc8f0e9aed9993954617075 100644
--- a/Source/core/html/HTMLFormElement.cpp
+++ b/Source/core/html/HTMLFormElement.cpp
@@ -184,7 +184,7 @@ void HTMLFormElement::submitImplicitly(Event* event, bool fromImplicitSubmission
         FormAssociatedElement* formAssociatedElement = m_associatedElements[i];
         if (!formAssociatedElement->isFormControlElement())
             continue;
-        HTMLFormControlElement* formElement = static_cast<HTMLFormControlElement*>(formAssociatedElement);
+        Handle<HTMLFormControlElement> formElement(static_cast<HTMLFormControlElement*>(formAssociatedElement));
         if (formElement->isSuccessfulSubmitButton()) {
             if (formElement->renderer()) {
                 formElement->dispatchSimulatedClick(event);
@@ -197,13 +197,13 @@ void HTMLFormElement::submitImplicitly(Event* event, bool fromImplicitSubmission
         prepareForSubmission(event);
 }
 
-static inline HTMLFormControlElement* submitElementFromEvent(const Event* event)
+static inline Result<HTMLFormControlElement> submitElementFromEvent(const Event* event)
 {
     for (Node* node = event->target()->toNode(); node; node = node->parentNode()) {
         if (node->isElementNode() && toElement(node)->isFormControlElement())
-            return static_cast<HTMLFormControlElement*>(node);
+            return Handle<HTMLFormControlElement>(static_cast<HTMLFormControlElement*>(node));
     }
-    return 0;
+    return nullptr;
 }
 
 bool HTMLFormElement::validateInteractively(Event* event)
@@ -212,7 +212,7 @@ bool HTMLFormElement::validateInteractively(Event* event)
     if (!document()->page() || !document()->page()->settings()->interactiveFormValidationEnabled() || noValidate())
         return true;
 
-    HTMLFormControlElement* submitElement = submitElementFromEvent(event);
+    Handle<HTMLFormControlElement> submitElement = submitElementFromEvent(event);
     if (submitElement && submitElement->formNoValidate())
         return true;
 
@@ -311,7 +311,7 @@ void HTMLFormElement::getTextFieldValues(StringPairVector& fieldNamesAndValues)
         if (!element->hasLocalName(inputTag))
             continue;
 
-        HTMLInputElement* input = static_cast<HTMLInputElement*>(control);
+        Handle<HTMLInputElement> input(static_cast<HTMLInputElement*>(control));
         if (!input->isTextField())
             continue;
 
@@ -334,7 +334,7 @@ void HTMLFormElement::submit(Event* event, bool activateSubmitButton, bool proce
     m_isSubmittingOrPreparingForSubmission = true;
     m_wasUserSubmitted = processingUserGesture;
 
-    HTMLFormControlElement* firstSuccessfulSubmitButton = 0;
+    Handle<HTMLFormControlElement> firstSuccessfulSubmitButton;
     bool needButtonActivation = activateSubmitButton; // do we need to activate a submit button?
 
     for (unsigned i = 0; i < m_associatedElements.size(); ++i) {
@@ -342,7 +342,7 @@ void HTMLFormElement::submit(Event* event, bool activateSubmitButton, bool proce
         if (!associatedElement->isFormControlElement())
             continue;
         if (needButtonActivation) {
-            HTMLFormControlElement* control = static_cast<HTMLFormControlElement*>(associatedElement);
+            Handle<HTMLFormControlElement> control(static_cast<HTMLFormControlElement*>(associatedElement));
             if (control->isActivatedSubmit())
                 needButtonActivation = false;
             else if (firstSuccessfulSubmitButton == 0 && control->isSuccessfulSubmitButton())
@@ -619,17 +619,17 @@ bool HTMLFormElement::wasUserSubmitted() const
     return m_wasUserSubmitted;
 }
 
-HTMLFormControlElement* HTMLFormElement::defaultButton() const
+Result<HTMLFormControlElement> HTMLFormElement::defaultButton() const
 {
     for (unsigned i = 0; i < m_associatedElements.size(); ++i) {
         if (!m_associatedElements[i]->isFormControlElement())
             continue;
-        HTMLFormControlElement* control = static_cast<HTMLFormControlElement*>(m_associatedElements[i]);
+        Handle<HTMLFormControlElement> control(static_cast<HTMLFormControlElement*>(m_associatedElements[i]));
         if (control->isSuccessfulSubmitButton())
             return control;
     }
 
-    return 0;
+    return nullptr;
 }
 
 bool HTMLFormElement::checkValidity()
@@ -650,7 +650,7 @@ bool HTMLFormElement::checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<Form
     bool hasInvalidControls = false;
     for (unsigned i = 0; i < elements.size(); ++i) {
         if (elements[i]->form() == this && elements[i]->isFormControlElement()) {
-            HTMLFormControlElement* control = static_cast<HTMLFormControlElement*>(elements[i].get());
+            Handle<HTMLFormControlElement> control(static_cast<HTMLFormControlElement*>(elements[i].get()));
             if (!control->checkValidity(&unhandledInvalidControls) && control->form() == this)
                 hasInvalidControls = true;
         }
@@ -658,14 +658,14 @@ bool HTMLFormElement::checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<Form
     return hasInvalidControls;
 }
 
-HTMLFormControlElement* HTMLFormElement::elementForAlias(const AtomicString& alias)
+Result<HTMLFormControlElement> HTMLFormElement::elementForAlias(const AtomicString& alias)
 {
     if (alias.isEmpty() || !m_elementAliases)
-        return 0;
-    return m_elementAliases->get(alias.impl()).get();
+        return nullptr;
+    return m_elementAliases->get(alias.impl());
 }
 
-void HTMLFormElement::addElementAlias(HTMLFormControlElement* element, const AtomicString& alias)
+void HTMLFormElement::addElementAlias(Handle<HTMLFormControlElement> element, const AtomicString& alias)
 {
     if (alias.isEmpty())
         return;
@@ -678,16 +678,16 @@ void HTMLFormElement::getNamedElements(const AtomicString& name, Vector<RefPtr<N
 {
     elements()->namedItems(name, namedItems);
 
-    HTMLFormControlElement* aliasElement = elementForAlias(name);
+    Handle<HTMLFormControlElement> aliasElement = elementForAlias(name);
     if (aliasElement) {
-        if (namedItems.find(aliasElement) == notFound) {
+        if (namedItems.find(aliasElement.passRefPtr()) == notFound) {
             // We have seen it before but it is gone now. Still, we need to return it.
             // FIXME: The above comment is not clear enough; it does not say why we need to do this.
-            namedItems.append(aliasElement);
+            namedItems.append(aliasElement.passRefPtr());
         }
     }
-    if (namedItems.size() && namedItems.first() != aliasElement)
-        addElementAlias(static_cast<HTMLFormControlElement*>(namedItems.first().get()), name);
+    if (namedItems.size() && namedItems.first().get() != aliasElement.raw())
+        addElementAlias(Handle<HTMLFormControlElement>(static_cast<HTMLFormControlElement*>(namedItems.first().get())), name);
 }
 
 bool HTMLFormElement::shouldAutocomplete() const