Remove the checker and corresponding dead code

test/all_tests.dart

Index: test/all_tests.dart
diff --git a/test/all_tests.dart b/test/all_tests.dart
index b7c60cafa2e7240f405f91fd3e5d13b595e35dcd..56051ad11b10691eb434b47725739e580313c167 100644
--- a/test/all_tests.dart
+++ b/test/all_tests.dart
@@ -7,7 +7,6 @@ library dev_compiler.test.all_tests;
 
 import 'package:test/test.dart';
 
-import 'checker/self_host_test.dart' as self_host;
 import 'closure/closure_annotation_test.dart' as closure_annotation_test;
 import 'closure/closure_type_test.dart' as closure_type_test;
 import 'codegen_test.dart' as codegen_test;
@@ -20,7 +19,6 @@ void main() {
   group('report', report_test.main);
   group('dependency_graph', dependency_graph_test.main);
   group('codegen', () => codegen_test.main([]));
-  group('self_host', self_host.main);
   group('closure', () {
     closure_annotation_test.main();
     closure_type_test.main();