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This CL adds new material design icon to mobile data notifications.
This CL also adds title "Mobile Data" to the notification.

The icon is effective only when
chrome://flags/#enable-message-center-new-style-notification
is Enabled (which is ToT default).

TEST=manual
BUG=726241

Change-Id: Ia71759dbbe44b1472721c784bb4e1c59b9a7df53
Reviewed-on: https://chromium-review.googlesource.com/666399
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502798}