Simpler return value of HashTable::add/HashMap:add and others

Source/core/dom/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.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 182 matching lines @@
 // Markers of the same type do not overlap each other.
 
 void DocumentMarkerController::addMarker(Node* node, const DocumentMarker& newMarker)
 {
     ASSERT(newMarker.endOffset() >= newMarker.startOffset());
     if (newMarker.endOffset() == newMarker.startOffset())
         return;
 
     m_possiblyExistingMarkerTypes.add(newMarker.type());
 
-    OwnPtr<MarkerLists>& markers = m_markers.add(node, nullptr).iterator->value;
+    OwnPtr<MarkerLists>& markers = m_markers.add(node, nullptr).storedValue->value;
     if (!markers) {
         markers = adoptPtr(new MarkerLists);
         markers->grow(DocumentMarker::MarkerTypeIndexesCount);
     }
 
     DocumentMarker::MarkerTypeIndex markerListIndex = MarkerTypeToMarkerIndex(newMarker.type());
     if (!markers->at(markerListIndex)) {
         markers->insert(markerListIndex, adoptPtr(new MarkerList));
     }
 
@@ skipping 521 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 void showDocumentMarkers(const WebCore::DocumentMarkerController* controller)
 {
     if (controller)
         controller->showMarkers();
 }
 #endif