R1:eaf7aedb05d0

Enforce blame in Skip Past This Commit

Test Plan:
# Set default view to non-blame.
# Visit URL with '?view=blame'.
# Click //Skip Past This Commit//.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3494