Move chromeos::device_event_log into components.

chrome/browser/resources/device_log_ui/device_log_ui.css

 /*
  * Copyright 2014 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 html {
   height: 100%;
 }
 
@@ skipping 95 matching lines @@
   color: darkgreen;
 }
 
 .log-type-network {
   color: darkblue;
 }
 
 .log-type-power {
   color: purple;
 }