R1:27422ffe8e3a

Use single quotes in JavaScript files

Summary: Use single quotes to keep JSHint happy.

Test Plan: `arc lint`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11431