Revert "Revert "remove support for serialized pictures before aug 2019""

This reverts commit 59e1602a5237cc6ccae83ae56ad679f6f773bbb8.

Change-Id: Id43c23f80294c42b4f15fe2f3b65247d6e1baac3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/302836
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
17 files changed