Switch dart2js 'typedef name = mixinApplication' to 'class name = mixinApplication'.

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

 // Copyright (c) 2011, 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;
 
 const DONT_KNOW_HOW_TO_FIX = "";
 
 /**
  * The messages in this file should meet the following guide lines:
@@ skipping 1013 matching lines @@
       "Error: '+' is not a prefix operator. ",
       howToFix: "Try removing '+'.",
       examples: const [
           "main() => +2;  // No longer a valid way to write '2'"
       ]);
 
   static const MessageKind UNSUPPORTED_THROW_WITHOUT_EXP = const MessageKind(
       "Error: No expression after 'throw'. "
       "Did you mean 'rethrow'?");
 
+  static const MessageKind DEPRECATED_TYPEDEF_MIXIN_SYNTAX = const MessageKind(
+      "Warning: 'typedef' not allowed here. ",
+      howToFix: "Try replacing 'typedef' with 'class'.",
+      examples: const [
+          """
+class B { }
+class M1 {  }
+typedef C = B with M1;  // Need to replace 'typedef' with 'class'.
+main() { new C(); }
+"""]
+);
+
   static const MessageKind MIRRORS_EXPECTED_STRING = const MessageKind(
       "Hint: Can't use '#{name}' here because it's an instance of '#{type}' "
       "and a 'String' value is expected.",
       howToFix: "Did you forget to add quotes?",
       examples: const [
           """
 // 'Foo' is a type literal, not a string.
 @MirrorsUsed(symbols: const [Foo])
 import 'dart:mirrors';
 
@@ skipping 360 matching lines @@
 
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);
 }
 
 class CompilationError extends Diagnostic {
   CompilationError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);
 }