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The code stopped working when paper-icon-button-light was updated to its
latest version, which changed the structure of the DOM.

Bug: 860854
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I0c7189752a5ae47eab0024e3e81775a5f93ee7b6
Reviewed-on: https://chromium-review.googlesource.com/1128463Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573531}