Make shift+tab close listbox The tab key already closes the listbox, and allowing shift+tab to be pressed without making it close the listbox allows the user to unexpectedly be able to move focus outside of the listbox. Fixed: 358045504 Bug: 40266261 Change-Id: I2aa3533e60dc5bcb0789b936d340faf6e8ad6cbd Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5769331 Reviewed-by: Traian Captan tcaptan@chromium.org Commit-Queue: Joey Arhar jarhar@chromium.org Cr-Commit-Position: refs/heads/main@{#1341047}