Switch unload-disallowed-subframe to explicitly set policy on main frame.
It was using the default which made the test outcome depend on the
status of DeprecateUnload. Instead, explicitly set the policy so that
the test is indepdent of the flag.
Bug: 1432116
Change-Id: Ibf76189d970fd4f772eb600186bdb4fdff4bd999
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5644418
Commit-Queue: Rakina Zata Amni rakina@chromium.org
Auto-Submit: Fergal Daly fergal@chromium.org
Reviewed-by: Rakina Zata Amni rakina@chromium.org
Cr-Commit-Position: refs/heads/main@{#1317834}