remove legacy flag

BUG=skia:

Change-Id: I030b85ef794d9098eeee7ac7c995a2b516218cfc
NOTRY=True
Reviewed-on: https://skia-review.googlesource.com/9620
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed