[strong] Deprecate delete

test/mjsunit/strong/delete.js

Index: test/mjsunit/strong/delete.js
diff --git a/test/mjsunit/strong/delete.js b/test/mjsunit/strong/delete.js
new file mode 100644
index 0000000000000000000000000000000000000000..90e229d54665962c7fea9cfd5ef7eb3cc4441896
--- /dev/null
+++ b/test/mjsunit/strong/delete.js
@@ -0,0 +1,11 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --strong-mode
+
+(function NoDelete() {
+  const o = {a: 0};
+  assertThrows("'use strong'; delete o.a", SyntaxError);
+  assertThrows("'use strong'; delete o", SyntaxError);
+})();