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>
diff --git a/images/mandrill_128.png b/images/mandrill_128.png
index 32f1637..33e76c6 100644
--- a/images/mandrill_128.png
+++ b/images/mandrill_128.png
Binary files differ
diff --git a/images/mandrill_16.png b/images/mandrill_16.png
index e5703f5..574ae07 100644
--- a/images/mandrill_16.png
+++ b/images/mandrill_16.png
Binary files differ
diff --git a/images/mandrill_256.png b/images/mandrill_256.png
index 0c69084..393ea1d 100644
--- a/images/mandrill_256.png
+++ b/images/mandrill_256.png
Binary files differ
diff --git a/images/mandrill_32.png b/images/mandrill_32.png
index c30e451..4839410 100644
--- a/images/mandrill_32.png
+++ b/images/mandrill_32.png
Binary files differ
diff --git a/images/mandrill_64.png b/images/mandrill_64.png
index d2e94cc..8c5e93d 100644
--- a/images/mandrill_64.png
+++ b/images/mandrill_64.png
Binary files differ