Remove unused API.

dart/sdk/lib/_internal/compiler/implementation/code_buffer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js;
 
 class CodeBuffer implements StringBuffer {
 
   StringBuffer buffer = new StringBuffer();
   List<CodeBufferMarker> markers = new List<CodeBufferMarker>();
@@ skipping 56 matching lines @@
         markers.add(other.markers[i]);
       }
       lastBufferOffset = buffer.length + other.lastBufferOffset;
     }
     buffer.write(other.getText());
     return this;
   }
 
   CodeBuffer addAll(Iterable<Object> iterable) => writeAll(iterable);
 
-  CodeBuffer addCharCode(int charCode) => writeCharCode(charCode);
-
   CodeBuffer writeCharCode(int charCode) {
     buffer.writeCharCode(charCode);
     return this;
   }
 
   CodeBuffer clear() {
     buffer = new StringBuffer();
     markers.clear();
     lastBufferOffset = 0;
     return this;
@@ skipping 30 matching lines @@
     });
   }
 }
 
 class CodeBufferMarker {
   final int offsetDelta;
   final sourcePosition;
 
   CodeBufferMarker(this.offsetDelta, this.sourcePosition);
 }