Disable test for rare in-page navigation kill in new navigation logic.

This case is almost never hit in practice, so it should be safe to
switch to the new navigation path before fixing it.

BUG=618100
TEST=No product behavior change.
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2095833004
Cr-Commit-Position: refs/heads/master@{#401951}
3 files changed