Don't autofocus new expression widget
Don't autofocus new expression widget

Test Plan: Loaded test.html with an expression widget, nothing blew up.

Reviewers: aria

Reviewed By: aria

Subscribers: jessie

Differential Revision: http://phabricator.khanacademy.org/D12870

sachgits/perseus,chirilo/perseus,chirilo/perseus,sachgits/perseus,ariabuckles/perseus,alexristich/perseus,abe4mvp/perseus,iamchenxin/perseus,ariabuckles/perseus,ariabuckles/perseus,learningequality/perseus,alexristich/perseus,abe4mvp/perseus,iamchenxin/perseus,ariabuckles/perseus,learningequality/perseus,daukantas/perseus,daukantas/perseus