lint errors

An error occurred running eslint. Please check the following error messages:

Could not load globals from file /Users/bsilverberg/mozilla-central/browser/base/content/browser.js: Error: Invalid ecmaVersion.
You may need to update the mappings in /Users/bsilverberg/mozilla-central/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js
Could not load globals from file /Users/bsilverberg/mozilla-central/browser/base/content/browser.js: Error: Invalid ecmaVersion.
Error: Could not load globals from file /Users/bsilverberg/mozilla-central/browser/base/content/browser.js: Error: Invalid ecmaVersion.
    at getScriptGlobals (/Users/bsilverberg/mozilla-central/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js:102:13)
    at getMozillaCentralItems (/Users/bsilverberg/mozilla-central/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js:121:25)
    at Object.<anonymous> (/Users/bsilverberg/mozilla-central/tools/lint/eslint/eslint-plugin-mozilla/lib/environments/browser-window.js:127:2)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)
A failure occurred in the eslint linter.
✖ 1 problem (0 errors, 0 warnings, 1 failure)