remove metadata from canvas

Bug: skia:
Change-Id: Id8eefff4f65317d749f4b96620a5e469425b4c4a
Reviewed-on: https://skia-review.googlesource.com/c/189169
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
2 files changed