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This CL replaces main view icons of UnifiedSystemTray by new ones.
Network icon is not included as it requires special handling.
Detailed view icons will be also updated in upcoming CLs.

Screenshot: http://screen/Kb8w2tQxdkP

TEST=manual
BUG=842079

Change-Id: Icd7454d8b26b642c58a0b014b7d6081069d38e7d
Reviewed-on: https://chromium-review.googlesource.com/1118080Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572062}