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

Source/web/WebFrameImpl.cpp

Index: Source/web/WebFrameImpl.cpp
diff --git a/Source/web/WebFrameImpl.cpp b/Source/web/WebFrameImpl.cpp
index 3676b6fc189921e3255116f5e2e68e73b7437e22..93c0a0e7c0f4708cc34a5e43f2a97d4e5ce57c16 100644
--- a/Source/web/WebFrameImpl.cpp
+++ b/Source/web/WebFrameImpl.cpp
@@ -2226,7 +2226,7 @@ WebFrameImpl* WebFrameImpl::fromFrame(LocalFrame* frame)
 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());
 }
@@ -2263,9 +2263,10 @@ void WebFrameImpl::setFindEndstateFocusAndSelection()
         // 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())