Stop casting HTMLInputElement to HTMLInputElement.

third_party/WebKit/Source/core/html/forms/RadioInputType.cpp

 /*
  * Copyright (C) 2005, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 94 matching lines @@
   // changing the selection.
   Document& document = element().document();
   if (isSpatialNavigationEnabled(document.frame()))
     return;
   bool forward = computedTextDirection() == TextDirection::kRtl
                      ? (key == "ArrowDown" || key == "ArrowLeft")
                      : (key == "ArrowDown" || key == "ArrowRight");
 
   // We can only stay within the form's children if the form hasn't been demoted
   // to a leaf because of malformed HTML.
-  HTMLInputElement* inputElement = findNextFocusableRadioButtonInGroup(
-      toHTMLInputElement(&element()), forward);
+  HTMLInputElement* inputElement =
+      findNextFocusableRadioButtonInGroup(&element(), forward);
   if (!inputElement) {
     // Traverse in reverse direction till last or first radio button
     forward = !(forward);
-    HTMLInputElement* nextInputElement = findNextFocusableRadioButtonInGroup(
-        toHTMLInputElement(&element()), forward);
+    HTMLInputElement* nextInputElement =
+        findNextFocusableRadioButtonInGroup(&element(), forward);
     while (nextInputElement) {
       inputElement = nextInputElement;
       nextInputElement =
           findNextFocusableRadioButtonInGroup(nextInputElement, forward);
     }
   }
   if (inputElement) {
     document.setFocusedElement(inputElement,
                                FocusParams(SelectionBehaviorOnFocus::Restore,
                                            WebFocusTypeNone, nullptr));
@@ skipping 102 matching lines @@
                          *inputElement, current->form(), forward)) {
     if (current->form() == inputElement->form() &&
         inputElement->type() == InputTypeNames::radio &&
         inputElement->name() == current->name())
       return inputElement;
   }
   return nullptr;
 }
 
 }  // namespace blink