Bug 1367235 - Enable eslint on testing/xpcshell - mechanical updates; r=Standard8

.eslintignore

testing/xpcshell/dbg-actors.js

testing/xpcshell/example/unit/.eslintrc.js

testing/xpcshell/example/unit/check_profile.js

testing/xpcshell/example/unit/test_check_nsIException.js

.../xpcshell/example/unit/test_check_nsIException_failing.js

testing/xpcshell/example/unit/test_do_check_matches.js

...ng/xpcshell/example/unit/test_do_check_matches_failing.js

testing/xpcshell/example/unit/test_import_module.js

testing/xpcshell/example/unit/test_load.js

testing/xpcshell/example/unit/test_profile.js

testing/xpcshell/example/unit/test_profile_afterChange.js

testing/xpcshell/example/unit/test_sample.js

testing/xpcshell/head.js