Enhance Chrome's ResourceRules to protect the entire Contents directory.
Enhance Chrome's ResourceRules to protect the entire Contents directory.

Currently Chrome's ResourceRules allows arbitrary files to be added to the
Contents/ directory without breaking the code signature. This is not a
huge security risk, but it is a concern. This eliminates the hole.

BUG=523045

Review URL: https://codereview.chromium.org/1448463005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#362214}

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