Added Data Reduction Proxy owners for iOS
Added Data Reduction Proxy owners for iOS

Added the same owners to ios/chrome/browser/data_reduction_proxy
as are in chrome/browser/net/spdyproxy/, which is where the
data reduction proxy lives for non-iOS Chrome.

BUG=568177

Review URL: https://codereview.chromium.org/1512493004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#364532}

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