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Polymer already protects against XSS injection, we just need to
combine the two strings.

Bug: 822939
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I866d65419b22d63a1c5a460f6a30304e4a5d487a
Reviewed-on: https://chromium-review.googlesource.com/981599
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547113}