Revert "[skottie] Initial property setters"

This reverts commit 79039572478acdadfc15ad81b13bc76f54bf2cd1.

Reason for revert: breaking SAN bots

Original change's description:
> [skottie] Initial property setters
> 
> Introduce a PropertyObserver to receive property notifications for layer
> and shape nodes.
> 
> Properties are communicated using strongly-typed "handles", which act
> as impedance adapters between the AE/BM model and the internal Skottie
> model.
> 
> Bug: skia:
> Change-Id: Ieb9be1ff843673f1f4fe900d3774c36956b7c941
> Reviewed-on: https://skia-review.googlesource.com/156186
> Commit-Queue: Florin Malita <fmalita@chromium.org>
> Reviewed-by: Mike Reed <reed@google.com>

TBR=fmalita@chromium.org,reed@google.com

Change-Id: Ic737766e305bb8dff10a817fa37f16fdfa051c93
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/156620
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
11 files changed