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This reverts commit d70e8035.

Reason for revert: compilation error

Original change's description:
> [Mash] Serialize the rest of RichNotificationData and Notification.
> 
> TBR=rdevlin.cronin@chromium.org
> 
> Bug: 578868
> Change-Id: I362564a5469fedd7f16024303b8dfd54046da8b1
> Reviewed-on: https://chromium-review.googlesource.com/917527
> Commit-Queue: Evan Stade <estade@chromium.org>
> Reviewed-by: Evan Stade <estade@chromium.org>
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#537315}

TBR=jamescook@chromium.org,stevenjb@chromium.org,rdevlin.cronin@chromium.org,estade@chromium.org,tsepez@chromium.org

Change-Id: I1aba72cf82a62a469f44441795d02053b832b71e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 578868
Reviewed-on: https://chromium-review.googlesource.com/924059Reviewed-by: Thiemo Nagel <tnagel@chromium.org>
Commit-Queue: Thiemo Nagel <tnagel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537325}