Move all main methods to tool/.

pkg/front_end/tool/fasta/parser.dart

Index: pkg/front_end/tool/fasta/parser.dart
diff --git a/pkg/front_end/tool/fasta/parser.dart b/pkg/front_end/tool/fasta/parser.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b6091b46a2d292c6340f3b72a7365f1a8cdb5819
--- /dev/null
+++ b/pkg/front_end/tool/fasta/parser.dart
@@ -0,0 +1,8 @@
+// Copyright (c) 2017, 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.
+
+import 'package:front_end/src/fasta/parser/parser_main.dart'
+    show mainEntryPoint;
+
+main(List<String> arguments) => mainEntryPoint(arguments);