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

Source/core/html/RadioNodeList.cpp

Index: Source/core/html/RadioNodeList.cpp
diff --git a/Source/core/html/RadioNodeList.cpp b/Source/core/html/RadioNodeList.cpp
index 9e0b10b8598fb2ab7367779168b270c9d61ddbf8..7caf143362cd602d82b584ec6e8ca65628e86549 100644
--- a/Source/core/html/RadioNodeList.cpp
+++ b/Source/core/html/RadioNodeList.cpp
@@ -49,12 +49,12 @@ RadioNodeList::~RadioNodeList()
     ownerNode()->nodeLists()->removeCacheWithAtomicName(this, RadioNodeListType, m_name);
 }
 
-static inline HTMLInputElement* toRadioButtonInputElement(Node* node)
+static inline Result<HTMLInputElement> toRadioButtonInputElement(Node* node)
 {
     ASSERT(node->isElementNode());
-    HTMLInputElement* inputElement = node->toInputElement();
+    Handle<HTMLInputElement> inputElement = node->toInputElement();
     if (!inputElement || !inputElement->isRadioButton() || inputElement->value().isEmpty())
-        return 0;
+        return nullptr;
     return inputElement;
 }
 
@@ -62,7 +62,7 @@ String RadioNodeList::value() const
 {
     for (unsigned i = 0; i < length(); ++i) {
         Node* node = item(i);
-        const HTMLInputElement* inputElement = toRadioButtonInputElement(node);
+        Handle<const HTMLInputElement> inputElement = toRadioButtonInputElement(node);
         if (!inputElement || !inputElement->checked())
             continue;
         return inputElement->value();
@@ -74,7 +74,7 @@ void RadioNodeList::setValue(const String& value)
 {
     for (unsigned i = 0; i < length(); ++i) {
         Node* node = item(i);
-        HTMLInputElement* inputElement = toRadioButtonInputElement(node);
+        Handle<HTMLInputElement> inputElement = toRadioButtonInputElement(node);
         if (!inputElement || inputElement->value() != value)
             continue;
         inputElement->setChecked(true);
@@ -103,7 +103,7 @@ bool RadioNodeList::nodeMatches(Element* testElement) const
     if (!testElement->hasTagName(objectTag) && !testElement->isFormControlElement())
         return false;
 
-    if (HTMLInputElement* inputElement = testElement->toInputElement()) {
+    if (Handle<HTMLInputElement> inputElement = testElement->toInputElement()) {
         if (inputElement->isImageButton())
             return false;
     }