[Push] Add rayankans@ to OWNERS

Change-Id: I23c43c704aaf3484d495560f0f1659bcc7534916
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248565
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Commit-Queue: Peter Beverloo <peter@chromium.org>
Auto-Submit: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779259}

content/browser/push_messaging/OWNERS

@@ -12,6 +12,7 @@
 johnme@chromium.org
 mvanouwerkerk@chromium.org
 peter@chromium.org
+rayankans@chromium.org
 
 # TEAM: platform-capabilities@chromium.org
 # COMPONENT: Blink>PushAPI