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and remove the old Polymer dialogue

Bug: 822504
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I30bf627099d257363bb4cd8177c07fbd147974ec
Reviewed-on: https://chromium-review.googlesource.com/1037043
Commit-Queue: Renée Wright <rjwright@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556735}