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Paper-button-light doesn't support the alt property, so aria-label should be used instead.
R=dmazzoni@chromium.org, fukumi@chromium.org

Tested: Manually using Jaws
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I8db2a1c399f41fafc577634062df37972a80a816
Reviewed-on: https://chromium-review.googlesource.com/890778Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534830}