Remove deprecated methods from ClassBuilder.

pkg/front_end/lib/src/fasta/builder/class_builder.dart

 // Copyright (c) 2016, 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.
 
 library fasta.class_builder;
 
 import '../problems.dart' show internalProblem;
 
 import 'builder.dart'
     show
@@ skipping 202 matching lines @@
     library.addCompileTimeError(message, charOffset, fileUri);
   }
 
   void addWarning(Message message, int charOffset) {
     library.addWarning(message, charOffset, fileUri);
   }
 
   void addNit(Message message, int charOffset) {
     library.addNit(message, charOffset, fileUri);
   }
-
-  void deprecated_addCompileTimeError(int charOffset, String message) {
-    library.deprecated_addCompileTimeError(charOffset, message,
-        fileUri: fileUri);
-  }
-
-  void deprecated_addWarning(int charOffset, String message) {
-    library.deprecated_addWarning(charOffset, message, fileUri: fileUri);
-  }
 }