Fix more tests that trigger multiple navigations with window.open

Similar to the fix in crrev.com/c/7548187, these tests would actually only commit the last navigation, and the first navigation gets cancelled. This behavior would cause flakiness with RenderDocument + SkipRendererCancellationThrottle because the first navigation might not get cancelled in e.g. headless test runners.

This CL modifies the test or removes them when other test coverage already exists.

Bug: 40615943 Change-Id: Ic853d75a5d4830e773a8fac8f19d5207bb91c773 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7556573 Commit-Queue: Rakina Zata Amni rakina@chromium.org Reviewed-by: Fergal Daly fergal@chromium.org Cr-Commit-Position: refs/heads/main@{#1581578}