[debug-wrappers] remove mirror tests.

test/mjsunit/mirror-null.js

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-
-// Flags: --expose-debug-as debug
-// Test the mirror object for null
-
-// Create mirror and JSON representation.
-var mirror = debug.MakeMirror(null);
-var serializer = debug.MakeMirrorSerializer();
-var json = JSON.stringify(serializer.serializeValue(mirror));
-
-// Check the mirror hierachy.
-assertTrue(mirror instanceof debug.Mirror);
-assertTrue(mirror instanceof debug.NullMirror);
-
-// Check the mirror properties.
-assertTrue(mirror.isNull());
-assertEquals('null', mirror.type());
-assertTrue(mirror.isPrimitive());
-
-// Test text representation
-assertEquals('null', mirror.toText());
-
-// Parse JSON representation and check.
-var fromJSON = eval('(' + json + ')');
-assertEquals('null', fromJSON.type);