Remove deprecated Wuffs io_buffer::reader calls

Bug: skia:8235
Change-Id: I5a73089c8c9febd3cedf41d0f2e3a52baebda1c9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227956
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed