7010792: remove bad debugging method from javac

Reviewed-by: mcimadamore

src/share/classes/com/sun/tools/javac/parser/Scanner.java

@@ -282,12 +282,6 @@ public class Scanner implements Lexer {
         sbuf[sp++] = ch;
     }
 
-    /** For debugging purposes: print character.
-     */
-    private void dch() {
-        System.err.print(ch); System.out.flush();
-    }
-
     /** Read next character in character or string literal and copy into sbuf.
      */
     private void scanLitChar() {