Add isHTMLPlugInElement() helpers for consistency with other HTML elements

Source/core/page/FocusController.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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 29 matching lines @@
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/htmlediting.h" // For firstPositionInOrBeforeNode
 #include "core/events/Event.h"
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/frame/DOMWindow.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLAreaElement.h"
 #include "core/html/HTMLImageElement.h"
+#include "core/html/HTMLPlugInElement.h"
 #include "core/html/HTMLShadowElement.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/EventHandler.h"
 #include "core/page/FrameTree.h"
 #include "core/page/Page.h"
 #include "core/frame/Settings.h"
 #include "core/page/SpatialNavigation.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderLayer.h"
@@ skipping 315 matching lines @@
 
     if (node == document->focusedElement())
         // Focus wrapped around to the same node.
         return true;
 
     if (!node->isElementNode())
         // FIXME: May need a way to focus a document here.
         return false;
 
     Element* element = toElement(node);
-    if (element->isFrameOwnerElement() && (!element->isPluginElement() || !element->isKeyboardFocusable())) {
+    if (element->isFrameOwnerElement() && (!isHTMLPlugInElement(*element) || !element->isKeyboardFocusable())) {
         // We focus frames rather than frame owners.
         // FIXME: We should not focus frames that have no scrollbars, as focusing them isn't useful to the user.
         HTMLFrameOwnerElement* owner = toHTMLFrameOwnerElement(element);
         if (!owner->contentFrame())
             return false;
 
         document->setFocusedElement(nullptr);
         setFocusedFrame(owner->contentFrame());
         return true;
     }
@@ skipping 508 matching lines @@
         startingRect = nodeRectInAbsoluteCoordinates(container, true /* ignore border */);
         container = scrollableEnclosingBoxOrParentFrameForNodeInDirection(type, container);
         if (container && container->isDocumentNode())
             toDocument(container)->updateLayoutIgnorePendingStylesheets();
     } while (!consumed && container);
 
     return consumed;
 }
 
 } // namespace WebCore