Use isHTMLTextAreaElement and toHTMLTextAreaElement

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2270 matching lines @@
         if (input->isTimeField())
             return WebTextInputTypeTime;
         if (input->isWeekField())
             return WebTextInputTypeWeek;
         if (input->isTextField())
             return WebTextInputTypeText;
 
         return WebTextInputTypeNone;
     }
 
-    if (node->hasTagName(HTMLNames::textareaTag)) {
-        if (static_cast<HTMLTextAreaElement*>(node)->isDisabledOrReadOnly())
+    if (isHTMLTextAreaElement(node)) {
+        if (toHTMLTextAreaElement(node)->isDisabledOrReadOnly())
             return WebTextInputTypeNone;
         return WebTextInputTypeTextArea;
     }
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
     if (node->isHTMLElement()) {
         HTMLElement* element = toHTMLElement(node);
         if (element->isDateTimeFieldElement())
             return WebTextInputTypeDateTimeField;
     }
@@ skipping 1863 matching lines @@
 }
 
 bool WebViewImpl::shouldDisableDesktopWorkarounds()
 {
     ViewportArguments arguments = mainFrameImpl()->frame()->document()->viewportArguments();
     return arguments.width == ViewportArguments::ValueDeviceWidth || !arguments.userZoom
         || (arguments.minZoom == arguments.maxZoom && arguments.minZoom != ViewportArguments::ValueAuto);
 }
 
 } // namespace WebKit