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

Source/core/html/track/TextTrackCueList.h

Index: Source/core/html/track/TextTrackCueList.h
diff --git a/Source/core/html/track/TextTrackCueList.h b/Source/core/html/track/TextTrackCueList.h
index 3bdeea814894a0f8026983d3f0c9b6c38e5d0eec..0f11f2b60c2de7ec35dd749a0dda0211619a59a4 100644
--- a/Source/core/html/track/TextTrackCueList.h
+++ b/Source/core/html/track/TextTrackCueList.h
@@ -53,13 +53,13 @@ public:
     bool add(PassRefPtrWillBeRawPtr<TextTrackCue>);
     bool remove(TextTrackCue*);
 
-    bool updateCueIndex(TextTrackCue*);
+    void 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);