Remove mcasas@chromium.org from third_party/blink/web_tests/external/wpt/geolocation/OWNERS

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Change-Id: Id5d5a97f7b93f3904ecbacb68b0efe7bbb798c92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5800665


Auto-Submit: Owners Cleanup <swarming-tasks@owners-cleanup-prod.google.com.iam.gserviceaccount.com>
Commit-Queue: Weizhong Xia <weizhong@google.com>
Reviewed-by: Weizhong Xia <weizhong@google.com>
Cr-Commit-Position: refs/heads/main@{#1345148}