add 'slow' prefix to RenderObject's firstChild() / lastChild() methods

Source/core/rendering/TextAutosizer.h

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 100 matching lines @@
     unsigned computeCompositeClusterHash(Vector<TextAutosizingClusterInfo>&);
     float computeMultiplier(Vector<TextAutosizingClusterInfo>&, const TextAutosizingWindowInfo&, float textWidth);
 
     // Use to traverse the tree of descendants, excluding descendants of containers (but returning the containers themselves).
     static RenderObject* nextInPreOrderSkippingDescendantsOfContainers(const RenderObject*, const RenderObject* stayWithin);
 
     static const RenderBlock* findDeepestBlockContainingAllText(const RenderBlock* cluster);
 
     // Depending on the traversal direction specified, finds the first or the last leaf text node child that doesn't
     // belong to any cluster.
-    static const RenderObject* findFirstTextLeafNotInCluster(const RenderObject*, size_t& depth, TraversalDirection);
+    static const RenderObject* findFirstTextLeafNotInCluster(const RenderBlock*, size_t& depth, TraversalDirection);
 
     // Returns groups of narrow descendants of a given autosizing cluster. The groups are combined
     // by the difference between the width of the descendant and the width of the parent cluster's
     // |blockContainingAllText|.
     static void getNarrowDescendantsGroupedByWidth(const TextAutosizingClusterInfo& parentClusterInfo, Vector<Vector<TextAutosizingClusterInfo> >&);
 
     void addNonAutosizedCluster(unsigned key, TextAutosizingClusterInfo& value);
     void secondPassProcessStaleNonAutosizedClusters();
     void processStaleContainer(float multiplier, RenderBlock* cluster, TextAutosizingClusterInfo&);
 
     Document* m_document;
 
     HashMap<const RenderObject*, unsigned> m_hashCache;
 
     // Mapping from all autosized (i.e. multiplier > 1) cluster hashes to their respective multipliers.
     HashMap<unsigned, float> m_hashToMultiplier;
     Vector<unsigned> m_hashesToAutosizeSecondPass;
 
     // Mapping from a cluster hash to the corresponding cluster infos which have not been autosized yet.
     HashMap<unsigned, OwnPtr<Vector<TextAutosizingClusterInfo> > > m_nonAutosizedClusters;
 
     bool m_previouslyAutosized;
 };
 
 } // namespace WebCore
 
 #endif // TextAutosizer_h