Make RenderedRectsForMarkers() to ignore disconnected nodes.

third_party/WebKit/Source/core/editing/markers/DocumentMarkerController.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, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
@@ skipping 498 matching lines @@
   if (!PossiblyHasMarkers(marker_type))
     return result;
   DCHECK(!(markers_.IsEmpty()));
 
   // outer loop: process each node
   MarkerMap::iterator end = markers_.end();
   for (MarkerMap::iterator node_iterator = markers_.begin();
        node_iterator != end; ++node_iterator) {
     // inner loop; process each marker in this node
     const Node& node = *node_iterator->key;
+    if (!node.isConnected())
+      continue;
     MarkerLists* markers = node_iterator->value.Get();
     for (size_t marker_list_index = 0;
          marker_list_index < DocumentMarker::kMarkerTypeIndexesCount;
          ++marker_list_index) {
       Member<MarkerList>& list = (*markers)[marker_list_index];
       if (!list || list->IsEmpty() ||
           (*list->begin())->GetType() != marker_type)
         continue;
       for (unsigned marker_index = 0; marker_index < list->size();
            ++marker_index) {
@@ skipping 348 matching lines @@
 }
 
 }  // namespace blink
 
 #ifndef NDEBUG
 void showDocumentMarkers(const blink::DocumentMarkerController* controller) {
   if (controller)
     controller->ShowMarkers();
 }
 #endif