[debug-wrappers] remove mirror tests.

test/mjsunit/debug-toggle-mirror-cache.js

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-
-// Flags: --expose-debug-as debug
-
-var handle1 = debug.MakeMirror(123).handle();
-assertEquals("number", debug.LookupMirror(handle1).type());
-
-debug.ToggleMirrorCache(false);
-var handle2 = debug.MakeMirror(123).handle();
-assertEquals(undefined, handle2);
-assertThrows(function() { debug.LookupMirror(handle2) });
-
-debug.ToggleMirrorCache(true);
-var handle3 = debug.MakeMirror(123).handle();
-assertEquals("number", debug.LookupMirror(handle3).type());