Align strong-mode error codes with analyzer conv.

pkg/analyzer/test/src/task/strong/strong_test_helper.dart

 // Copyright (c) 2015, 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.
 
 // TODO(jmesserly): this file needs to be refactored, it's a port from
 // package:dev_compiler's tests
 library test.src.task.strong.strong_test_helper;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
@@ skipping 79 matching lines @@
 
         var source = unit.source;
         if (source.uri.scheme == 'dart') continue;
 
         var librarySource = context.getLibrariesContaining(source).single;
         var resolved = context.resolveCompilationUnit2(source, librarySource);
         var analyzerErrors = context
             .getErrors(source)
             .errors
             .where((error) =>
-                error.errorCode.name.startsWith('dev_compiler.InferredType'))
+                error.errorCode.name.startsWith('STRONG_MODE_INFERRED_TYPE'))
             .toList();
         errors.addAll(analyzerErrors);
         checker.visitCompilationUnit(resolved);
 
         new _ExpectedErrorVisitor(errors).validate(resolved);
       }
     }
   });
 }
 
@@ skipping 365 matching lines @@
     results.add(lib);
     lib.importedLibraries.forEach(find);
     lib.exportedLibraries.forEach(find);
   }
   find(start);
   return results;
 }
 
 String errorCodeName(ErrorCode errorCode) {
   var name = errorCode.name;
-  final prefix = 'dev_compiler.';
+  final prefix = 'STRONG_MODE_';
   if (name.startsWith(prefix)) {
     return name.substring(prefix.length);
   } else {
     // TODO(jmesserly): this is for backwards compat, but not sure it's very
     // useful to log this.
     return 'AnalyzerMessage';
   }
 }
 
 /// Returns an ANSII color escape sequence corresponding to [levelName]. Colors
 /// are defined for: severe, error, warning, or info. Returns null if the level
 /// name is not recognized.
 String colorOf(String levelName) {
   levelName = levelName.toLowerCase();
   if (levelName == 'shout' || levelName == 'severe' || levelName == 'error') {
     return _RED_COLOR;
   }
   if (levelName == 'warning') return _MAGENTA_COLOR;
   if (levelName == 'info') return _CYAN_COLOR;
   return null;
 }
 
 const String _RED_COLOR = '\u001b[31m';
 const String _MAGENTA_COLOR = '\u001b[35m';
 const String _CYAN_COLOR = '\u001b[36m';
 const String GREEN_COLOR = '\u001b[32m';
 const String NO_COLOR = '\u001b[0m';