Remove more warnings.

lib/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.
 
 class MessageKind {
   final String template;
   const MessageKind(this.template);
 
   static const GENERIC = const MessageKind('#{1}');
 
@@ skipping 279 matching lines @@
     if (object is SourceString) {
       return object.slowToString();
     } else {
       return object.toString();
     }
   }
 }
 
 class Diagnostic {
   final Message message;
-  Diagnostic(MessageKind kind, List<Type> arguments)
+  Diagnostic(MessageKind kind, List arguments)
     : message = new Message(kind, arguments);
   String toString() => message.toString();
 }
 
 class TypeWarning extends Diagnostic {
-  TypeWarning(MessageKind kind, List<Type> arguments)
+  TypeWarning(MessageKind kind, List arguments)
     : super(kind, arguments);
 }
 
 class ResolutionError extends Diagnostic {
-  ResolutionError(MessageKind kind, List<Type> arguments)
+  ResolutionError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }
 
 class ResolutionWarning extends Diagnostic {
-  ResolutionWarning(MessageKind kind, List<Type> arguments)
+  ResolutionWarning(MessageKind kind, List arguments)
     : super(kind, arguments);
 }
 
 class CompileTimeConstantError extends Diagnostic {
-  CompileTimeConstantError(MessageKind kind, List<Type> arguments)
+  CompileTimeConstantError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }
 
 class CompilationError extends Diagnostic {
-  CompilationError(MessageKind kind, List<Type> arguments)
+  CompilationError(MessageKind kind, List arguments)
     : super(kind, arguments);
 }