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In Video Player polymer_config.js was writing to console.error:
polymer_config.js:15 Polymer is already defined.

This was caused by <paper-slider.html> being included before any of
WebUI or Files app Polymer element had a chance to initialize with the
right config (polymer.html), which in turn was causing Polymer elements
to render without shadowRoot.

Change <files_icon_button> to include before <paper-slider> so it loads
the right config/polymer.html.

Test: --gtest_filter='VideoPlayerBrowserTest.CheckInitialElements' also manually checked for no error message and play button has shadowRoot.
Bug: 875525
Change-Id: I9888992cce762cd6eae8c31a8042119506fd5590
Reviewed-on: https://chromium-review.googlesource.com/1248342
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594620}