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This CL replaces all uses of blink::PlatformNotificationActionType with
blink::mojom::NotificationActionType in order to reduce type conversion
between them.

Bug: 919392
Change-Id: I70426fe09f9d42085fa54ffaebf8a0587ca8ca04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498241Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#821125}