Split MessageKind into a MessageKind key and a MessageTemplate.

pkg/compiler/lib/src/dump_info.dart

 // Copyright (c) 2013, 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 dump_info;
 
 import 'dart:convert' show
     HtmlEscape,
     JsonEncoder,
     StringConversionSink,
@@ skipping 621 matching lines @@
       'noSuchMethodEnabled': backend.enabledNoSuchMethod,
       'minified': compiler.enableMinification
     };
 
     outJson['program'] = generalProgramInfo;
 
     ChunkedConversionSink<Object> sink =
       encoder.startChunkedConversion(
           new StringConversionSink.fromStringSink(buffer));
     sink.add(outJson);
-    compiler.reportInfo(NO_LOCATION_SPANNABLE,
-        const MessageKind(
-            "View the dumped .info.json file at "
-            "https://dart-lang.github.io/dump-info-visualizer"));
+    compiler.reportInfo(
+        NO_LOCATION_SPANNABLE,
+        MessageKind.GENERIC,
+        {'text': "View the dumped .info.json file at "
+                 "https://dart-lang.github.io/dump-info-visualizer"});
   }
 }