MatcherID          15 extensions/browser/event_listener_map.cc typedef EventFilter::MatcherID MatcherID;
MatcherID          23 extensions/common/event_filter.h   typedef int MatcherID;
MatcherID          90 extensions/common/event_filter.h   typedef std::map<MatcherID, linked_ptr<EventMatcherEntry> > EventMatcherMap;