Add melandory@ to invalidations owners

R=nyquist@chromium.org

Change-Id: I869d1b4f2c3b2b08dfcb95e76e94f123d0f12f24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610523Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659383}

chrome/browser/invalidation/OWNERS

 dcheng@chromium.org
+melandory@chromium.org
 nyquist@chromium.org
 pavely@chromium.org
 

ios/chrome/browser/invalidation/OWNERS

 dcheng@chromium.org
+melandory@chromium.org
 nyquist@chromium.org
 pavely@chromium.org