Revert "Tweak public APIs and use them in patch_sdk, dart2js, and kernel-service."

pkg/front_end/lib/front_end.dart

Index: pkg/front_end/lib/front_end.dart
diff --git a/pkg/front_end/lib/front_end.dart b/pkg/front_end/lib/front_end.dart
deleted file mode 100644
index c5907e640422daa4b63b70056242cfe2b634ade7..0000000000000000000000000000000000000000
--- a/pkg/front_end/lib/front_end.dart
+++ /dev/null
@@ -1,14 +0,0 @@
-// 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.
-
-/// The Dart Front End contains logic to build summaries and kernel programs
-/// from Dart sources. The APIs exposed here are designed for tools in the Dart
-/// ecosystem that need to load sources and convert them to these formats.
-library front_end.front_end;
-
-export 'compiler_options.dart';
-export 'compilation_error.dart';
-export 'kernel_generator.dart';
-export 'summary_generator.dart';
-export 'file_system.dart';