Don't define legacy flag

Change-Id: I0c0b5012af81647e75c5bbaab9f7d69dade53a8b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/370476
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed