[strong] Remove all remainders of strong mode

test/mjsunit/strong/equality.js

Index: test/mjsunit/strong/equality.js
diff --git a/test/mjsunit/strong/equality.js b/test/mjsunit/strong/equality.js
deleted file mode 100644
index 5e2464c372771df089ee5117ca66a571b35172b2..0000000000000000000000000000000000000000
--- a/test/mjsunit/strong/equality.js
+++ /dev/null
@@ -1,10 +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 NoSloppyEquality() {
-  assertThrows("'use strong'; 0 == 0", SyntaxError);
-  assertThrows("'use strong'; 0 != 0", SyntaxError);
-})();