Update mandrill PNGs to be sRGB (rather than gamma 2.2)

This eliminates many GM diffs between gl and glsrgb.

Bug: skia:
Change-Id: Ia35ae9db3f9dba03c227f82d2ad7ab602100d2e9
Reviewed-on: https://skia-review.googlesource.com/139861
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
5 files changed