Remove DSL-based constructor expressions.

These are no longer used anywhere.

Change-Id: I760a86a835be40b572c330277a19b703ad028d5c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/695964
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
3 files changed