Re-land of CL 2990703002, adding fixes to analyzer_test and error_test.

pkg/analyzer/lib/src/dart/error/syntactic_errors.dart

 // Copyright (c) 2014, 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.
 
 /**
  * The errors produced during syntactic analysis (scanning and parsing).
  */
 library analyzer.src.dart.error.syntactic_errors;
 
 import 'package:analyzer/error/error.dart';
@@ skipping 964 matching lines @@
       "The return type can't be 'var'.",
       "Try removing the keyword 'var', or "
       "replacing it with the name of the return type.");
 
   static const ParserErrorCode VAR_TYPEDEF = const ParserErrorCode(
       'VAR_TYPEDEF',
       "Typedefs can't be declared to be 'var'.",
       "Try removing the keyword 'var', or "
       "replacing it with the name of the return type.");
 
-  static const ParserErrorCode VOID_PARAMETER = const ParserErrorCode(
-      'VOID_PARAMETER',
-      "Parameters can't have a type of 'void'.",
-      "Try removing the keyword 'var', or "
-      "replacing it with the name of the type of the parameter.");
-
-  static const ParserErrorCode VOID_VARIABLE = const ParserErrorCode(
-      'VOID_VARIABLE',
-      "Variables can't have a type of 'void'.",
-      "Try removing the keyword 'void', or "
-      "replacing it with the name of the type of the variable.");
-
   /**
    * Initialize a newly created error code to have the given [name]. The message
    * associated with the error will be created from the given [message]
    * template. The correction associated with the error will be created from the
    * given [correction] template.
    */
   const ParserErrorCode(String name, String message, [String correction])
       : super(name, message, correction);
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.ERROR;
 
   @override
   ErrorType get type => ErrorType.SYNTACTIC_ERROR;
 }