Replace open-coded binary search in TextTrackCueList::add with upper_bound

Source/core/html/track/TextTrackCueList.h

 /*
  * Copyright (C) 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 41 matching lines @@
 
     bool add(PassRefPtrWillBeRawPtr<TextTrackCue>);
     bool remove(TextTrackCue*);
 
     bool updateCueIndex(TextTrackCue*);
 
     DECLARE_TRACE();
 
 private:
     TextTrackCueList();
-    bool add(PassRefPtrWillBeRawPtr<TextTrackCue>, size_t, size_t);
+    size_t findInsertionIndex(const TextTrackCue*) const;
     void clear();
     void invalidateCueIndexes(size_t);
 
     WillBeHeapVector<RefPtrWillBeMember<TextTrackCue>> m_list;
     RefPtrWillBeMember<TextTrackCueList> m_activeCues;
 };
 
 } // namespace blink
 
 #endif // TextTrackCueList_h