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This CL changes the <paper-icon-button> elements to <button> with
is="paper-icon-button-light".

Bug: 746584
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I045badb04115139ac3f624f9b6a57d161dafc55c
Reviewed-on: https://chromium-review.googlesource.com/588012Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491192}