[debug-wrappers] remove mirror tests.

test/mjsunit/mirror-undefined.js

-// Copyright 2008 the V8 project authors. All rights reserved.
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-
-// Flags: --expose-debug-as debug
-// Test the mirror object for undefined
-
-// Create mirror and JSON representation.
-var mirror = debug.MakeMirror(void 0);
-var serializer = debug.MakeMirrorSerializer();
-var json = JSON.stringify(serializer.serializeValue(mirror));
-
-// Check the mirror hierachy.
-assertTrue(mirror instanceof debug.Mirror);
-assertTrue(mirror instanceof debug.UndefinedMirror);
-
-// Check the mirror properties.
-assertTrue(mirror.isUndefined());
-assertEquals('undefined', mirror.type());
-assertTrue(mirror.isPrimitive());
-
-// Test text representation
-assertEquals('undefined', mirror.toText());
-
-// Parse JSON representation and check.
-var fromJSON = eval('(' + json + ')');
-assertEquals('undefined', fromJSON.type);