R1:c87ff2622b58

Apply D5832 to Phabricator

Summary: Brings the Javelin change in D5832 into Phabricator.

Test Plan: Hit a `/?&x` URI without hanging Safari.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D5833