test: remove broken debugger scenarios

`test-debug-break-on-uncaught` was hanging on the domain and parse error
scenarios. These tests are not run in CI and may have been broken
for a very long time.

Refs: https://github.com/nodejs/node/issues/3156
Refs: https://github.com/nodejs/node/commit/c16963b9
PR-URL: https://github.com/nodejs/node/pull/5532
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rod Vagg <r@va.gg>

test/debugger/test-debug-break-on-uncaught.js

@@ -7,11 +7,6 @@ var debug = require('_debugger');
 
 addScenario('global.js', null, 2);
 addScenario('timeout.js', null, 2);
-addScenario('domain.js', null, 10);
-
-// Exception is thrown from vm.js via module.js (internal file)
-//   var compiledWrapper = runInThisContext(wrapper, filename, 0, true);
-addScenario('parse-error.js', 'vm.js', null);
 
 run();