Move all main methods to tool/.

pkg/front_end/test/fasta/bootstrap_test.dart

Index: pkg/front_end/test/fasta/bootstrap_test.dart
diff --git a/pkg/front_end/test/fasta/bootstrap_test.dart b/pkg/front_end/test/fasta/bootstrap_test.dart
index 39fa7f9a694d7334b21f40c5de75421c89d0e4f9..265c6160ad4931dc9e58b7e876c84853118c886a 100644
--- a/pkg/front_end/test/fasta/bootstrap_test.dart
+++ b/pkg/front_end/test/fasta/bootstrap_test.dart
@@ -23,10 +23,8 @@ import 'package:kernel/text/ast_to_text.dart' show programToString;
 
 Future main() async {
   asyncStart();
-  Uri sourceCompiler = await Isolate.resolvePackageUri(
-      Uri.parse("package:front_end/src/fasta/bin/compile.dart"));
-  Uri outline = await Isolate.resolvePackageUri(
-      Uri.parse("package:front_end/src/fasta/bin/outline.dart"));
+  Uri sourceCompiler = Uri.base.resolve("pkg/front_end/tool/fasta/compile.dart");
+  Uri outline = Uri.base.resolve("pkg/front_end/tool/fasta/outline.dart");
   Uri packages = await Isolate.packageConfig;
   Directory tmp = await Directory.systemTemp.createTemp("fasta_bootstrap");
   Uri compiledOnceOutput = tmp.uri.resolve("fasta1.dill");