Reland crrev.com/335097 w/ the following fixes:
- Remove now unused qunit_proto.js
- Ensure the gyp variable has _files in the name, as that implies
  special (necessary) path handling

--

chromoting: Add JS externs for qunit.

This is one of a few fixes needed to enable ES6 mode in remoting/.

BUG=481705
Committed: https://crrev.com/ffbf1b6110ff79b0f9683a4f4acc67baf4900499
Cr-Commit-Position: refs/heads/master@{#335097}

Review URL: https://codereview.chromium.org/1195643002

Cr-Commit-Position: refs/heads/master@{#335532}
6 files changed