Don't fail the style assert in Element::rendererIsFocusable if the document is active.

Source/web/WebLocalFrameImpl.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 1674 matching lines @@
     if (this != mainFrameImpl->activeMatchFrame())
         return;
 
     if (Range* activeMatch = m_textFinder->activeMatch()) {
         // 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;
 
+        // Need to clean out style and layout state before querying Element::isFocusable().
+        frame()->document()->updateLayoutIgnorePendingStylesheets();
+
         // 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 = activeMatch->firstNode();
         if (node && node->isInShadowTree()) {
             if (Node* host = node->shadowHost()) {
                 if (isHTMLInputElement(*host) || isHTMLTextAreaElement(*host))
                     node = host;
             }
         }
         for (; node; node = node->parentNode()) {
@@ skipping 156 matching lines @@
 
 void WebLocalFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink