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This CL fixes an issue where the CBD button would stay grey after the
CBD button was activated via spacebar.

BUG=640894
NO_DEPENDENCY_CHECKS=true
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2282403002
Cr-Commit-Position: refs/heads/master@{#418807}