Remove dart2dart support from testing scripts and status files

tools/testing/dart/co19_test.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Tool for running co19 tests. Used when updating co19.
  *
  * Currently, this tool is merely a convenience around multiple
  * invocations of test.dart. Long term, we hope to evolve this into a
  * script that can automate most of the tasks necessary when updating
@@ skipping 12 matching lines @@
 import "test_configurations.dart";
 
 const List<String> COMMON_ARGUMENTS =
     const <String>['--report', '--progress=diff', 'co19'];
 
 const List<List<String>> COMMAND_LINES = const <List<String>>[
     const <String>['-mrelease,debug', '-rvm', '-cnone'],
     const <String>['-mrelease,debug', '-rvm', '-cnone', '--checked'],
     const <String>['-mrelease', '-rnone', '-cdartanalyzer'],
     const <String>['-mrelease', '-rnone', '-cdart2analyzer'],
-    const <String>['-mrelease', '-rvm', '-cdart2dart', '--use-sdk'],
-    const <String>['-mrelease', '-rvm', '-cdart2dart', '--use-sdk', '--minified'],
     const <String>['-mrelease', '-rd8', '-cdart2js', '--use-sdk'],
     const <String>['-mrelease', '-rd8,jsshell', '-cdart2js', '--use-sdk',
                    '--minified'],
     const <String>['-mrelease', '-rd8,jsshell', '-cdart2js', '--use-sdk',
                    '--checked'],
     const <String>['-mrelease', '-rdartium', '-cnone', '--use-sdk',
                    '--checked'],
     const <String>['-mrelease', '-rdartium', '-cnone', '--use-sdk'],
 ];
 
 void main(List<String> args) {
   TestUtils.setDartDirUri(Platform.script.resolve('../../..'));
   var optionsParser = new TestOptionsParser();
   List<Map> configurations = <Map>[];
   for (var commandLine in COMMAND_LINES) {
     List arguments = <String>[];
     arguments.addAll(COMMON_ARGUMENTS);
     arguments.addAll(args);
     arguments.addAll(commandLine);
     configurations.addAll(optionsParser.parse(arguments));
   }
 
   if (configurations != null || configurations.length > 0) {
     testConfigurations(configurations);
   }
 }