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By polymer specification all styling should be done inside <template>
element. Preprocessor embeds <link rel="stylesheet"> into resulting
HTML.

Bug: 955194
Change-Id: I91cbadf0b73cc771619a9041e2f7c662199f3740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010773
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733441}