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Deprecated Shortcut notification was using cogwheel icon.
This CL changes the notification to use more specific keyboard icon.

TEST=manual (Press Shift-Esc)
BUG=792589

Change-Id: I62ed098ade7f3fd3d03bd140553190fed5293bb4
Reviewed-on: https://chromium-review.googlesource.com/818866
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523672}