Add myself to OWNERS in Files app's private custom bindings.
Add myself to OWNERS in Files app's private custom bindings.

TEST=None
BUG=None

Review URL: https://codereview.chromium.org/1253363002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#340599}

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