Revert "Revert "remove legacy forward declares""

This reverts commit 48913465db5f6077be48a7333c56e03e77b107a1.

Add guard to stage this in chroe/win and google3

Bug: skia:
Change-Id: I409ccabaa4c1f1bb5fb27794b738a311833bebb2
Reviewed-on: https://skia-review.googlesource.com/c/188822
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
1 file changed