Incognito notification: use new ChromeNotificationBuilder API.

This CL converts incognito notification to use new builder API which
support general notification metric recording, including:

Mobile.SystemNotification.Action.Click
Mobile.SystemNotification.Content.Click
Mobile.SystemNotification.Dismiss

Bug: 898269
Change-Id: I2953c849ae641ea79da3c7022e3352ea24b068ae
Reviewed-on: https://chromium-review.googlesource.com/c/1437483
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628026}
4 files changed