Add myself and rdevlin.cronin@ to chrome/browser/resources/extensions/OWNERS
Add myself and rdevlin.cronin@ to chrome/browser/resources/extensions/OWNERS

When kalman@ said "I'd rather dbeam review this" I knew it was time.[1]

R=kalman@chromium.org,rdevlin.cronin@chromium.org
BUG=none

NOTRY=true

[1] https://codereview.chromium.org/1207873002/#msg4

Review URL: https://codereview.chromium.org/1207283003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#336868}

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