Change ownership and +s chrome-sandbox
Change ownership and +s chrome-sandbox

Without this the container fails to start as the sandbox is not correctly setup.

BUG=551140

Review URL: https://codereview.chromium.org/1414793011

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#357851}

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