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Convert *.css files to *_style.html files for the following custom elements: date_time_page, settings_drawer, settings_main, settings_menu, settings_page_header, and settings_ui. See http://goo.gl/vIGSCO for more information.

BUG=477154

Review URL: https://codereview.chromium.org/1051763004

Cr-Commit-Position: refs/heads/master@{#325353}