Revert of [wasm] Enable WASM by default (--expose-wasm=true).

test/mjsunit/wasm/wasm-default.js

Index: test/mjsunit/wasm/wasm-default.js
diff --git a/test/mjsunit/wasm/wasm-default.js b/test/mjsunit/wasm/wasm-default.js
deleted file mode 100644
index 8d34ebbe1dceceb146cc5f993fccc67c26a82ab1..0000000000000000000000000000000000000000
--- a/test/mjsunit/wasm/wasm-default.js
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2016 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.
-
-function GetWebAssembly() {
-  return WebAssembly;
-}
-
-let WASM_ON_BY_DEFAULT = true;
-
-if (WASM_ON_BY_DEFAULT) {
-  try {
-    assertFalse(undefined === GetWebAssembly());
-  } catch (e) {
-    assertTrue(false);
-  }
-} else {
-  assertThrows(GetWebAssembly);
-}