Revert "OnTask: Allow windows to open in unlocked state"

This reverts commit 34759effd36a0142a120f1e90664c34d7c166cec.

Reason for revert: Seems to be breaking the linux-chromeos-archive-rel CQ -- https://ci.chromium.org/ui/p/chromium/builders/luci.chromium.ci/linux-chromeos-archive-rel

Original change's description:
> OnTask: Allow windows to open in unlocked state
>
> TEST=OnTaskLockedSessionWindowTrackerTest*
> Bug:b/369670500
>
> Change-Id: Ib731abac183f4c2293e2365d24ff938a501cfe78
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5893688
> Commit-Queue: Matthew Zhu <zhumatthew@google.com>
> Reviewed-by: Vignesh Shenvi <vshenvi@google.com>
> Cr-Commit-Position: refs/heads/main@{#1360909}

Bug: b/369670500
Change-Id: I1531c5896199e5754b34245a58a1da65c58031e4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5894629
Auto-Submit: Vignesh Shenvi <vshenvi@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1360927}