gcapi_mac: update supported OS versions to 10.9-10.11 inclusive
gcapi_mac: update supported OS versions to 10.9-10.11 inclusive

Review URL: https://codereview.chromium.org/1774623003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#379845}

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