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This CL enables crash reporting for notification_helper.exe by reusing the
crashpad handler embedded in chrome.exe. A new crash reporter client is
implemented for the notification_helper process as in class
NotificationHelperCrashReporterClient.

Bug: 734095, 817974
Change-Id: I279e1d7c8e1741fd09af9db9d4915d69b92e56c9
Reviewed-on: https://chromium-review.googlesource.com/924981Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Jianzhou Feng <jzfeng@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541283}