Make platform/peerconnection OWNERS the same as modules/peerconnection.

The responsibility of modules/peerconnection OWNERS should be no
different than platform/peerconnection. Making the platform OWNERS file
point to the modules OWNERS file.

NOTRY=True

Bug: none
Change-Id: I5054ba2f86bdae2f50991a3ad0b2eb315381c5fd
Reviewed-on: https://chromium-review.googlesource.com/c/1350871Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610845}

third_party/blink/renderer/platform/peerconnection/OWNERS

+file://third_party/blink/renderer/modules/peerconnection/OWNERS
+
+# COMPONENT: Blink>WebRTC