Update XR OWNERS files

-ddorwin
+klausw for ARCore SDK

Change-Id: I461be28f406fade03bf6e6c50acfbf5d5226edbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080453Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745780}

chrome/browser/android/vr/arcore_device/OWNERS

 bialpio@chromium.org
-ddorwin@chromium.org
 klausw@chromium.org
 
 # TEAM: xr-dev@chromium.org

chrome/services/isolated_xr_device/OWNERS

 alcooper@chromium.org
-ddorwin@chromium.org
 klausw@chromium.org
 
 # TEAM: xr-dev@chromium.org

third_party/arcore-android-sdk-client/OWNERS

 bialpio@chromium.org
-ddorwin@chromium.org
+klausw@chromium.org
 
 # TEAM: xr-dev@chromium.org
 # COMPONENT: Internals>XR>AR

third_party/arcore-android-sdk/OWNERS

 bialpio@chromium.org
-ddorwin@chromium.org
+klausw@chromium.org
 
 # TEAM: xr-dev@chromium.org
 # COMPONENT: Internals>XR>AR

third_party/libovr/OWNERS

 alcooper@chromium.org
 bajones@chromium.org
-ddorwin@chromium.org
 
 # TEAM: xr-dev@chromium.org
 # COMPONENT: Internals>XR>VR

third_party/openvr/OWNERS

 alcooper@chromium.org
 bajones@chromium.org
-ddorwin@chromium.org
 
 # TEAM: xr-dev@chromium.org
 # COMPONENT: Internals>XR>VR