Remove unneeded and incorrect static_cast in AXMediaControlsContainer::controllingVideoElement

Source/core/accessibility/AXMediaControls.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 190 matching lines @@
     return queryString(controllingVideoElement() ? WebLocalizedString::AXMediaVideoElement : WebLocalizedString::AXMediaAudioElement);
 }
 
 String AXMediaControlsContainer::helpText() const
 {
     return queryString(controllingVideoElement() ? WebLocalizedString::AXMediaVideoElementHelp : WebLocalizedString::AXMediaAudioElementHelp);
 }
 
 bool AXMediaControlsContainer::controllingVideoElement() const
 {
-    if (!m_renderer->node())
+    Node* node = m_renderer->node();
+    if (!node)
         return true;
 
-    MediaControlTimeDisplayElement* element = static_cast<MediaControlTimeDisplayElement*>(m_renderer->node());
-
-    return isHTMLVideoElement(toParentMediaElement(element));
+    return isHTMLVideoElement(toParentMediaElement(node));
 }
 
 bool AXMediaControlsContainer::computeAccessibilityIsIgnored() const
 {
     return accessibilityIsIgnoredByDefault();
 }
 
 //
 // AccessibilityMediaTimeline
 
@@ skipping 64 matching lines @@
 {
     if (!m_renderer || !m_renderer->node())
         return String();
 
     MediaControlTimeDisplayElement* element = static_cast<MediaControlTimeDisplayElement*>(m_renderer->node());
     float time = element->currentValue();
     return localizedMediaTimeDescription(fabsf(time));
 }
 
 } // namespace WebCore