More owners for renderer_host/p2p

Delete juberti@ as non-committer
Add people currently working on webrtc

Bug: none
Change-Id: I5828538aedec8d507947fbfcbbe6801ff6f81be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2005990Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732948}

content/browser/renderer_host/p2p/OWNERS

+guidou@chromium.org
 sergeyu@chromium.org
-juberti@chromium.org
+steveanton@chromium.org
 
 # COMPONENT: Blink>WebRTC