[strong] Remove all remainders of strong mode

test/mjsunit/strong/class-extend-null.js

Index: test/mjsunit/strong/class-extend-null.js
diff --git a/test/mjsunit/strong/class-extend-null.js b/test/mjsunit/strong/class-extend-null.js
deleted file mode 100644
index 3ed7b36dbb4912765e97b74a615edbdf13efb599..0000000000000000000000000000000000000000
--- a/test/mjsunit/strong/class-extend-null.js
+++ /dev/null
@@ -1,97 +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 --allow-natives-syntax
-
-(function() {
-"use strict";
-
-let foo = null;
-
-function nullLiteral() {
-  class Class1 extends null {
-    constructor() {
-      super();
-    }
-  }
-}
-
-function nullVariable() {
-  class Class2 extends foo {
-    constructor() {
-      super();
-    }
-  }
-}
-
-function nullLiteralClassExpr() {
-  (class extends null {});
-}
-
-function nullVariableClassExpr() {
-  (class extends foo {});
-}
-
-assertDoesNotThrow(nullLiteral);
-%OptimizeFunctionOnNextCall(nullLiteral);
-assertDoesNotThrow(nullLiteral);
-
-assertDoesNotThrow(nullVariable);
-%OptimizeFunctionOnNextCall(nullVariable);
-assertDoesNotThrow(nullVariable);
-
-assertDoesNotThrow(nullLiteralClassExpr);
-%OptimizeFunctionOnNextCall(nullLiteralClassExpr);
-assertDoesNotThrow(nullLiteralClassExpr);
-
-assertDoesNotThrow(nullVariableClassExpr);
-%OptimizeFunctionOnNextCall(nullVariableClassExpr);
-assertDoesNotThrow(nullVariableClassExpr);
-})();
-
-(function() {
-"use strong";
-
-let foo = null;
-
-function nullLiteral() {
-  class Class1 extends null {
-    constructor() {
-      super();
-    }
-  }
-}
-
-function nullVariable() {
-  class Class2 extends foo {
-    constructor() {
-      super();
-    }
-  }
-}
-
-function nullLiteralClassExpr() {
-  (class extends null {});
-}
-
-function nullVariableClassExpr() {
-  (class extends foo {});
-}
-
-assertThrows(nullLiteral, TypeError);
-%OptimizeFunctionOnNextCall(nullLiteral);
-assertThrows(nullLiteral, TypeError);
-
-assertThrows(nullVariable, TypeError);
-%OptimizeFunctionOnNextCall(nullVariable);
-assertThrows(nullVariable, TypeError);
-
-assertThrows(nullLiteralClassExpr, TypeError);
-%OptimizeFunctionOnNextCall(nullLiteralClassExpr);
-assertThrows(nullLiteralClassExpr, TypeError);
-
-assertThrows(nullVariableClassExpr, TypeError);
-%OptimizeFunctionOnNextCall(nullVariableClassExpr);
-assertThrows(nullVariableClassExpr, TypeError);
-})();