Fix links after D1921

Test Plan:
Search for some symbol. Click on the result. Verify that there is not // in URL.
Click on the link from generated exception.
View history in Diffusion, click on Browse.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1979