[SxS] Change new split tab default layout to vertical Currently split tabs visually are in the vertical layout but the split tab data indicates that the tabs are actually in the horizontal layout. This CL updates new split creation to use the vertical layout instead so the data is consistent with what the split tab actually looks like. Bug: 403350993 Change-Id: If5a51b76ef70d3bd61625780e926c6e31172fb73 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6484194 Reviewed-by: Darryl James <dljames@chromium.org> Commit-Queue: Steven Luong <stluong@chromium.org> Cr-Commit-Position: refs/heads/main@{#1451332}
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