Revert "Move `analyzer_cli` into the SDK."

pkg/analyzer_cli/test/data/strong_example.dart

Index: pkg/analyzer_cli/test/data/strong_example.dart
diff --git a/pkg/analyzer_cli/test/data/strong_example.dart b/pkg/analyzer_cli/test/data/strong_example.dart
deleted file mode 100644
index 2f332cd92ce72555e0a913fc5c135daa045d0ab7..0000000000000000000000000000000000000000
--- a/pkg/analyzer_cli/test/data/strong_example.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (c) 2015, 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.
-
-/// This produces an error with --strong enabled, but not otherwise.
-class MyIterable extends Iterable<String> {
-  // Error: invalid override
-  Iterator<Object> get iterator => [1, 2, 3].iterator;
-}
-
-main() {
-  var i = new MyIterable().iterator..moveNext();
-  print(i.current);
-
-  // Error: type check failed
-  List<String> list = <dynamic>[1, 2, 3];
-  print(list);
-}