Update t_p/blink/renderer/modules/media/OWNERS

... pairing it up with content/renderer/media/OWNERS.

Note that perkj@ and emircan@ were skipped intentionally
because they no longer work on Chromium.

BUG=787252

Change-Id: Ief10bb7a9c0d5f775ab32270877a915ee2285396
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364056Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Antonio Gomes (GMT-4) <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#799801}

third_party/blink/renderer/modules/media/OWNERS

 file://media/OWNERS
+miu@chromium.org
+mfoltz@chromium.org
+
+# WebRTC OWNERS.
+hbos@chromium.org
+tommi@chromium.org
+guidou@chromium.org
+olka@chromium.org
 
 # COMPONENT: Internals>Media