HTMLPlugInElement: Use custom focus logic only when there is a plugin.

Source/core/html/HTMLPlugInElement.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 372 matching lines @@
 {
     // Needs to load the plugin immediatedly because this function is called
     // when JavaScript code accesses the plugin.
     // FIXME: Check if dispatching events here is safe.
     document().updateLayoutIgnorePendingStylesheets(Document::RunPostLayoutTasksSynchronously);
     return existingRenderPart();
 }
 
 bool HTMLPlugInElement::isKeyboardFocusable() const
 {
+    if (useFallbackContent() || usePlaceholderContent())
+        return HTMLElement::isKeyboardFocusable();
+
     if (!document().isActive())
         return false;
+
     return pluginWidget() && pluginWidget()->isPluginView() && toPluginView(pluginWidget())->supportsKeyboardFocus();
 }
 
 bool HTMLPlugInElement::hasCustomFocusLogic() const
 {
-    return !hasAuthorShadowRoot();
+    return renderer() && renderer()->isEmbeddedObject();
 }
 
 bool HTMLPlugInElement::isPluginElement() const
 {
     return true;
 }
 
 bool HTMLPlugInElement::rendererIsFocusable() const
 {
     if (HTMLFrameOwnerElement::supportsFocus() && HTMLFrameOwnerElement::rendererIsFocusable())
@@ skipping 235 matching lines @@
     return hasAuthorShadowRoot();
 }
 
 void HTMLPlugInElement::lazyReattachIfNeeded()
 {
     if (!useFallbackContent() && !usePlaceholderContent() && needsWidgetUpdate() && renderer() && !isImageType())
         lazyReattachIfAttached();
 }
 
 }