[strong] Remove all remainders of strong mode

test/mjsunit/strong/arrays.js

Index: test/mjsunit/strong/arrays.js
diff --git a/test/mjsunit/strong/arrays.js b/test/mjsunit/strong/arrays.js
deleted file mode 100644
index b9e4fad357d9f6b4091db45ed6001c10f012838b..0000000000000000000000000000000000000000
--- a/test/mjsunit/strong/arrays.js
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright 2015 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 NoEllisions() {
-  assertThrows("'use strong'; [,]", SyntaxError);
-  assertThrows("'use strong'; [,3]", SyntaxError);
-  assertThrows("'use strong'; [3,,4]", SyntaxError);
-  assertTrue(eval("'use strong'; [3,] !== [3,4,]"));
-})();