Remove mcasas@chromium.org from third_party/blink/web_tests/external/wpt/mediacapture-record/OWNERS

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https://chromium-review.googlesource.com/q/mcasas@chromium.org

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Change-Id: I53b3b37d502bbf9bb07b1373932470203f9abd62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5800756


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@{#1345150}