[debug-wrappers] remove mirror tests.

test/mjsunit/es6/mirror-symbols.js

-// 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: --expose-debug-as debug
-// Test the mirror object for symbols.
-
-function testSymbolMirror(symbol, description) {
-  // Create mirror and JSON representation.
-  var mirror = debug.MakeMirror(symbol);
-  var serializer = debug.MakeMirrorSerializer();
-  var json = JSON.stringify(serializer.serializeValue(mirror));
-
-  // Check the mirror hierachy.
-  assertTrue(mirror instanceof debug.Mirror);
-  assertTrue(mirror instanceof debug.ValueMirror);
-  assertTrue(mirror instanceof debug.SymbolMirror);
-
-  // Check the mirror properties.
-  assertTrue(mirror.isSymbol());
-  assertEquals(description, mirror.description());
-  assertEquals('symbol', mirror.type());
-  assertTrue(mirror.isPrimitive());
-  var description_text = description === undefined ? "" : description;
-  assertEquals('Symbol(' + description_text + ')', mirror.toText());
-  assertSame(symbol, mirror.value());
-
-  // Parse JSON representation and check.
-  var fromJSON = eval('(' + json + ')');
-  assertEquals('symbol', fromJSON.type);
-  assertEquals(description, fromJSON.description);
-}
-
-// Test a number of different symbols.
-testSymbolMirror(Symbol("a"), "a");
-testSymbolMirror(Symbol(12), "12");
-testSymbolMirror(Symbol.for("b"), "b");
-testSymbolMirror(Symbol(), undefined);