Drop LayoutVTTCue::adjustForTopAndBottomMarginBorderAndPadding

Source/core/layout/LayoutVTTCue.h

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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 26 matching lines @@
 public:
     LayoutVTTCue(ContainerNode*, float snapToLinesPosition);
 
     // The computed line position for snap-to-lines layout, and NaN for
     // non-snap-to-lines layout where no adjustment should take place.
     float snapToLinesPosition() { return m_snapToLinesPosition; }
 
 private:
     void layout() override;
 
-    void adjustForTopAndBottomMarginBorderAndPadding();
     void repositionCueSnapToLinesNotSet();
 
     float m_snapToLinesPosition;
 };
 
 } // namespace blink
 
 #endif // LayoutVTTCue_h