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Elements: <track-info-panel>, <track-list>, <control-panel> and
<audio-player>.

Move the <link> tag inside the <template> because this is enforced by
polymer_modulizer() this requires changing from rel="import" to normal
rel="stylesheet" which in turn requires to changed the URL to request
the CSS.

Fix all closure errors.

Bug: 1133186
Change-Id: I633ef710307afa8b1237a188a7b4d8932cbc0cdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526004Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825690}