Remove stl_util's deletion functions from media/.

media/base/text_renderer.h

Index: media/base/text_renderer.h
diff --git a/media/base/text_renderer.h b/media/base/text_renderer.h
index ab1867df75a7e53faf3cb4cf539309a883c31175..96aa0d51cb4c3e26cda71cd60984974af6699e75 100644
--- a/media/base/text_renderer.h
+++ b/media/base/text_renderer.h
@@ -121,8 +121,8 @@ class MEDIA_EXPORT TextRenderer {
   };
   State state_;
 
-  typedef std::map<DemuxerStream*, TextTrackState*> TextTrackStateMap;
-  TextTrackStateMap text_track_state_map_;
+  std::map<DemuxerStream*, std::unique_ptr<TextTrackState>>
+      text_track_state_map_;
 
   // Indicates how many read requests are in flight.
   int pending_read_count_;