[MtbCct] Enabled the feature by default For deploying 100% on stable, enables the feature by default. This includes enabling: - feature flag - cached version - open-in-browser to the top Also deletes the field trial config. Bug: 414824647 Change-Id: I2d63b290c4ebcea6b6423c8851db5744cb2c1357 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7545985 Commit-Queue: Jinsuk Kim <[email protected]> Reviewed-by: Theresa Sullivan <[email protected]> Cr-Commit-Position: refs/heads/main@{#1580032} NOKEYCHECK=True GitOrigin-RevId: de1d718bfd71618c531a69162ab57cafb98c51ef