Use new is*Element() helper functions more in HTML code

Source/core/html/shadow/TextControlInnerElements.cpp

 /*
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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:
  * 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 150 matching lines @@
     return element.release();
 }
 
 const AtomicString& SearchFieldDecorationElement::shadowPseudoId() const
 {
     DEFINE_STATIC_LOCAL(AtomicString, resultsDecorationId, ("-webkit-search-results-decoration", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, decorationId, ("-webkit-search-decoration", AtomicString::ConstructFromLiteral));
     Element* host = shadowHost();
     if (!host)
         return resultsDecorationId;
-    if (host->hasTagName(inputTag)) {
+    if (isHTMLInputElement(*host)) {
         if (toHTMLInputElement(host)->maxResults() < 0)
             return decorationId;
         return resultsDecorationId;
     }
     return resultsDecorationId;
 }
 
 void SearchFieldDecorationElement::defaultEventHandler(Event* event)
 {
     // On mousedown, focus the search field
@@ skipping 280 matching lines @@
 }
 
 void InputFieldSpeechButtonElement::stopSpeechInput()
 {
     if (m_state == Recording)
         speechInput()->stopRecording(m_listenerId);
 }
 #endif // ENABLE(INPUT_SPEECH)
 
 }