Cleanup: Start using toFoo methods as part of newly adopted coding guideline.

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 96 matching lines @@
         unsigned startOffset = textPiece->startOffset();
         unsigned endOffset = textPiece->endOffset();
         addMarker(textPiece->startContainer(), DocumentMarker(startOffset, endOffset, activeMatch));
         if (endOffset > startOffset) {
             // Rendered rects for markers in WebKit are not populated until each time
             // the markers are painted. However, we need it to happen sooner, because
             // the whole purpose of tickmarks on the scrollbar is to show where
             // matches off-screen are (that haven't been painted yet).
             Node* node = textPiece->startContainer();
             Vector<DocumentMarker*> markers = markersFor(node);
-            static_cast<RenderedDocumentMarker*>(markers[markers.size() - 1])->setRenderedRect(range->boundingBox());
+            toRenderedDocumentMarker(markers[markers.size() - 1])->setRenderedRect(range->boundingBox());
         }
     }
 }
 
 void DocumentMarkerController::removeMarkers(Range* range, DocumentMarker::MarkerTypes markerTypes, RemovePartiallyOverlappingMarkerOrNot shouldRemovePartiallyOverlappingMarker)
 {
     for (TextIterator markedText(range); !markedText.atEnd(); markedText.advance()) {
         if (!possiblyHasMarkers(markerTypes))
             return;
         ASSERT(!m_markers.isEmpty());
@@ skipping 528 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 void showDocumentMarkers(const WebCore::DocumentMarkerController* controller)
 {
     if (controller)
         controller->showMarkers();
 }
 #endif