Remove dart2dart support from testing scripts and status files

tools/status_clean.dart

 // Copyright (c) 2014, 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 status_clean;
 
 import "dart:async";
 import "dart:convert" show JSON, UTF8;
 import "dart:io";
 import "testing/dart/multitest.dart";
@@ skipping 23 matching lines @@
      "tests/compiler/dart2js_extra/dart2js_extra.status"],
     ["dart2js_native", "tests/compiler/dart2js_native",
      "tests/compiler/dart2js_native/dart2js_native.status"],
     ["dart2js", "tests/compiler/dart2js",
      "tests/compiler/dart2js/dart2js.status"],
     ["pub", "sdk/lib/_internal/pub", "sdk/lib/_internal/pub/pub.status"],
     ["benchmark_smoke", "tests/benchmark_smoke",
      "tests/benchmark_smoke/benchmark_smoke.status"],
     ["co19", "tests/co19/src", "tests/co19/co19-analyzer2.status"],
     ["co19", "tests/co19/src", "tests/co19/co19-analyzer.status"],
-    ["co19", "tests/co19/src", "tests/co19/co19-dart2dart.status"],
     ["co19", "tests/co19/src", "tests/co19/co19-dart2js.status"],
     ["co19", "tests/co19/src", "tests/co19/co19-co19.status"],
     ["co19", "tests/co19/src", "tests/co19/co19-dartium.status"],
     ["co19", "tests/co19/src", "tests/co19/co19-runtime.status"],
 ];
 
 void main(List<String> args) {
   TestUtils.setDartDirUri(Platform.script.resolve('..'));
   usage() {
     print("Usage: ${Platform.executable} <deflake|remove-nonexistent-tests>");
@@ skipping 353 matching lines @@
                       ": $error");
                 return [];
               }
             }).catchError((error) {
               print("Warning: Error occured while fetching testoutcomes: $error");
               return [];
             });
     });
   }
 }