camera-app: Extend flag expiry milestone and transfer ownership

The project is still on going but has been transferred to the camera app
team.

Change-Id: I24309a57cdfa6764294aee0b47196b848d085894
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067838Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Auto-Submit: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743441}

chrome/browser/flag-metadata.json

@@ -387,8 +387,8 @@
   },
   {
     "name": "camera-system-web-app",
-    "owners": [ "calamity", "ortuno" ],
-    "expiry_milestone": 82
+    "owners": [ "chromeos-camera-eng@google.com" ],
+    "expiry_milestone": 85
   },
   {
     "name": "cast-media-route-provider",