Currently third_party/mocha is using version 2.5.3. Latest mocha version according to [1] is 5.2.0.

While there is no specific feature available in the newer versions that I have in mind, we are falling quite a bit behind.

@michaelpg: You are currently listed as an OWNER at [1], which is why I assigned this to you. Let me know if you have no cycles to look into this.

Also, do you have any thoughts about removing third_party/mocha directory completely and using [3] to fetch mocha? This might make updating easier in the future (similarly to how we updated other NPM dependencies).

[1] https://github.com/mochajs/mocha/blob/master/CHANGELOG.md
[2] https://cs.chromium.org/chromium/src/third_party/mocha/OWNERS
[3] https://cs.chromium.org/chromium/src/third_party/node/package.json