Remove a part of type checking predicates of HTMLInputElement.

Source/core/html/forms/RadioInputType.cpp

Index: Source/core/html/forms/RadioInputType.cpp
diff --git a/Source/core/html/forms/RadioInputType.cpp b/Source/core/html/forms/RadioInputType.cpp
index 36a2c66bc42a3cbbfdf00fb8457eac8df5aa0e30..7b96112b0229f625446a000931b7471f6aeef62c 100644
--- a/Source/core/html/forms/RadioInputType.cpp
+++ b/Source/core/html/forms/RadioInputType.cpp
@@ -103,7 +103,7 @@ void RadioInputType::handleKeydownEvent(KeyboardEvent* event)
         HTMLInputElement* inputElement = toHTMLInputElement(htmlElement);
         if (inputElement->form() != element().form())
             break;
-        if (inputElement->isRadioButton() && inputElement->name() == element().name() && inputElement->isFocusable()) {
+        if (inputElement->type() == InputTypeNames::radio && inputElement->name() == element().name() && inputElement->isFocusable()) {
             RefPtrWillBeRawPtr<HTMLInputElement> protector(inputElement);
             document.setFocusedElement(inputElement);
             inputElement->dispatchSimulatedClick(event, SendNoEvents);
@@ -139,7 +139,7 @@ bool RadioInputType::isKeyboardFocusable() const
     Element* currentFocusedElement = element().document().focusedElement();
     if (isHTMLInputElement(currentFocusedElement)) {
         HTMLInputElement& focusedInput = toHTMLInputElement(*currentFocusedElement);
-        if (focusedInput.isRadioButton() && focusedInput.form() == element().form() && focusedInput.name() == element().name())
+        if (focusedInput.type() == InputTypeNames::radio && focusedInput.form() == element().form() && focusedInput.name() == element().name())
             return false;
     }
 
@@ -179,7 +179,7 @@ void RadioInputType::didDispatchClick(Event* event, const ClickHandlingState& st
         // Make sure it is still a radio button and only do the restoration if it still belongs to our group.
         HTMLInputElement* checkedRadioButton = state.checkedRadioButton.get();
         if (checkedRadioButton
-            && checkedRadioButton->isRadioButton()
+            && checkedRadioButton->type() == InputTypeNames::radio
             && checkedRadioButton->form() == element().form()
             && checkedRadioButton->name() == element().name()) {
             checkedRadioButton->setChecked(true);
@@ -190,11 +190,6 @@ void RadioInputType::didDispatchClick(Event* event, const ClickHandlingState& st
     event->setDefaultHandled();
 }
 
-bool RadioInputType::isRadioButton() const
-{
-    return true;
-}
-
 bool RadioInputType::shouldAppearIndeterminate() const
 {
     return !element().checkedRadioButtonForGroup();