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This CL implements NotificationActivator::Activate() which launches Chrome
to handle native notification activation, using a command line with the
--notification-launch-id switch.

Bug: 734095
Change-Id: I90c67ced93de1f4cc377188e0f414f2d2a9da2a5
Reviewed-on: https://chromium-review.googlesource.com/917821
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538985}