R1:dd81268a8e4f

Use dot notation in some places

Summary: Use `x.y` in favor of `x['y']` in //some// JavaScript callsites. Note that there are a bunch of places where the latter is explicitly used to trick `PhabricatorJavelinLinter`.

Test Plan: `arc lint`

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11442