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- changed the strings to match the new spec
- used ui::GetChromeOSDeviceName() in the notification text to
  show the correct device type (Chromebook/Chromebase etc).
- changed the notification type to NORMAL
- changed the display source from custom to default ("Chrome OS")
- changed the notification icon, used a MD asset
  (ic_info_outline_48px.svg scaled to 96px)

Bug: 957178
Test: manual
Change-Id: I3bf29c6ca8dba98fd80d9a43637354e560f0ca4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617012
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663884}