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This CL fixes a regression after we adapt responsive layout. We have
|pointer-events: none| on preview-box so we have to re-enable pointer
events on barcode chip container.

This does not caught by the Tast test because we "click()" the link
directly which ignores the pointer-events settings.

Bug: b/172879638
Test: Manually
Change-Id: I0a7a1a3a755ff1d37a7e7f3f25229a0c97ced16a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619445
Auto-Submit: Shik Chen <shik@chromium.org>
Commit-Queue: Inker Kuo <inker@chromium.org>
Reviewed-by: Inker Kuo <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841955}