Correct the null focusedFrame() check in Document

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 5426 matching lines @@
     if (Element* element = treeScope().adjustedFocusedElement())
         return element;
     return body();
 }
 
 bool Document::hasFocus() const
 {
     Page* page = this->page();
     if (!page)
         return false;
-    if (!page->focusController().isActive() || !page->focusController().isFocused() || !page->focusController().focusedFrame()->isLocalFrame())
+    if (!page->focusController().isActive() || !page->focusController().isFocused())
         return false;
-    if (LocalFrame* focusedFrame = toLocalFrame(page->focusController().focusedFrame())) {
-        if (focusedFrame->tree().isDescendantOf(frame()))
+    Frame* focusedFrame = page->focusController().focusedFrame();
+    if (focusedFrame && focusedFrame->isLocalFrame()) {
+        if (toLocalFrame(focusedFrame)->tree().isDescendantOf(frame()))
             return true;
     }
     return false;
 }
 
 // FIXME: Remove this code once we have input routing in the browser
 // process. See http://crbug.com/339659.
 void Document::defaultEventHandler(Event* event)
 {
     if (frame() && frame()->remotePlatformLayer()) {
@@ skipping 31 matching lines @@
 }
 
 void Document::invalidateNodeListCaches(const QualifiedName* attrName)
 {
     HashSet<LiveNodeListBase*>::iterator end = m_listsInvalidatedAtDocument.end();
     for (HashSet<LiveNodeListBase*>::iterator it = m_listsInvalidatedAtDocument.begin(); it != end; ++it)
         (*it)->invalidateCache(attrName);
 }
 
 } // namespace WebCore