Improve messages and static use for super/this-calls.

tests/compiler/dart2js/diagnose_ambiguous_test.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.
 
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/compiler_new.dart' show Diagnostic;
 import 'package:expect/expect.dart';
 import 'memory_compiler.dart';
 
 void main() {
   DiagnosticCollector collector = new DiagnosticCollector();
   asyncTest(() async {
     CompilationResult result = await runCompiler(
       memorySourceFiles: MEMORY_SOURCE_FILES,
       diagnosticHandler: collector,
       options: ['--analyze-all']);
 
     List<String> diagnostics = <String>[];
     collector.messages.forEach((DiagnosticMessage message) {
       if (message.kind == Diagnostic.VERBOSE_INFO) return;
       diagnostics.add(message.toString());
     });
     diagnostics.sort();
     var expected = [
-        "memory:exporter.dart:43:47:'hest' is defined here.:info",
-        "memory:library.dart:41:45:'hest' is defined here.:info",
-        "memory:main.dart:0:22:'hest' is imported here.:info",
-        "memory:main.dart:23:46:'hest' is imported here.:info",
-        "memory:main.dart:86:92:Duplicate import of 'hest'.:warning",
+        "MessageKind.AMBIGUOUS_LOCATION:"
+            "memory:exporter.dart:43:47:'hest' is defined here.:info",
+        "MessageKind.AMBIGUOUS_LOCATION:"
+            "memory:library.dart:41:45:'hest' is defined here.:info",
+        "MessageKind.DUPLICATE_IMPORT:"
+            "memory:main.dart:86:92:Duplicate import of 'hest'.:warning",
+        "MessageKind.IMPORTED_HERE:"
+            "memory:main.dart:0:22:'hest' is imported here.:info",
+        "MessageKind.IMPORTED_HERE:"
+            "memory:main.dart:23:46:'hest' is imported here.:info",
     ];
     Expect.listEquals(expected, diagnostics);
     Expect.isTrue(result.isSuccess);
   });
 }
 
 const Map MEMORY_SOURCE_FILES = const {
   'main.dart': """
 import 'library.dart';
 import 'exporter.dart';
@@ skipping 15 matching lines @@
 hest() {}
 """,
   'exporter.dart': """
 library exporter;
 
 export 'library.dart';
 
 hest() {}
 """,
 };