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

Source/web/WebFrameImpl.cpp

 /*
  * Copyright (C) 2009 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 2208 matching lines @@
         return 0;
     FrameLoaderClient* client = frame->loader().client();
     if (!client || !client->isFrameLoaderClientImpl())
         return 0;
     return toFrameLoaderClientImpl(client)->webFrame();
 }
 
 WebFrameImpl* WebFrameImpl::fromFrameOwnerElement(Element* element)
 {
     // FIXME: Why do we check specifically for <iframe> and <frame> here? Why can't we get the WebFrameImpl from an <object> element, for example.
-    if (!element || !element->isFrameOwnerElement() || (!element->hasTagName(HTMLNames::iframeTag) && !element->hasTagName(HTMLNames::frameTag)))
+    if (!element || !element->isFrameOwnerElement() || (!isHTMLIFrameElement(*element) && !isHTMLFrameElement(*element)))
         return 0;
     return fromFrame(toHTMLFrameOwnerElement(element)->contentFrame());
 }
 
 WebViewImpl* WebFrameImpl::viewImpl() const
 {
     if (!frame())
         return 0;
     return WebViewImpl::fromPage(frame()->page());
 }
@@ skipping 16 matching lines @@
         // If the user has set the selection since the match was found, we
         // don't focus anything.
         VisibleSelection selection(frame()->selection().selection());
         if (!selection.isNone())
             return;
 
         // Try to find the first focusable node up the chain, which will, for
         // example, focus links if we have found text within the link.
         Node* node = m_activeMatch->firstNode();
         if (node && node->isInShadowTree()) {
-            Node* host = node->deprecatedShadowAncestorNode();
-            if (host->hasTagName(HTMLNames::inputTag) || host->hasTagName(HTMLNames::textareaTag))
-                node = host;
+            if (Node* host = node->shadowHost()) {
+                if (isHTMLInputElement(*host) || isHTMLTextAreaElement(*host))
+                    node = host;
+            }
         }
         for (; node; node = node->parentNode()) {
             if (!node->isElementNode())
                 continue;
             Element* element = toElement(node);
             if (element->isFocusable()) {
                 // Found a focusable parent node. Set the active match as the
                 // selection and focus to the focusable node.
                 frame()->selection().setSelection(VisibleSelection(m_activeMatch.get()));
                 frame()->document()->setFocusedElement(element);
@@ skipping 205 matching lines @@
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace blink