Re-collect rule features for watched selectors.

third_party/WebKit/Source/core/dom/CSSSelectorWatch.h

 /*
  * Copyright (C) 2013 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 63 matching lines @@
     // Selectors are relative to m_matchingCallbackSelectors's contents at
     // the previous call to selectorMatchChanged.
     HashSet<String> m_addedSelectors;
     HashSet<String> m_removedSelectors;
 
     Timer<CSSSelectorWatch> m_callbackSelectorChangeTimer;
 
     // When an element is reparented, the new location's style is evaluated after the expriation of the relayout timer.
     // We don't want to send redundant callbacks to the embedder, so this counter lets us wait another time around the event loop.
     int m_timerExpirations;
+
+    friend class CSSSelectorWatchTest;
 };
 
 } // namespace blink
 
 #endif // CSSSelectorWatch_h