switch from bsalomon@chromium to bsalomon@google in skia/OWNERS

Change-Id: Ib2510b7ac727470a9900875a71b0630bcee5aed7
Reviewed-on: https://chromium-review.googlesource.com/1129329Reviewed-by: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#573367}

skia/OWNERS

 alokp@chromium.org
 borenet@google.com
-bsalomon@chromium.org
+bsalomon@google.com
 bungeman@google.com
 djsollen@google.com
 fmalita@chromium.org