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This fixes the issue with window activation not functioning correctly
when notifications are activated while Chrome is running but in the
background.

Bug: 837796, 734095
Change-Id: I69f5c358ba55fa997e1c3859d653638131f1394c
Reviewed-on: https://chromium-review.googlesource.com/1051708
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557949}