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This CL updates ethernet icon in UnifiedSystemTray to the one specified
in spec. Also, size of an icon in Unified's default view is 24.

TEST=manual
BUG=842079

Change-Id: I988d9449855201ba9f1ec096c11aacabc12d8dc4
Reviewed-on: https://chromium-review.googlesource.com/1123959Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580051}