Whiltelist raw postMessage usage in gaia/frontend kaiosbridgeservcie.js
Whiltelist raw postMessage usage in gaia/frontend kaiosbridgeservcie.js

The security review is in progress, we'd want to check in cl/217395740 now to unblock
integration test with Assistant app internally. The flow will not be rolled out
externally until security review is completed.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=220338801

lucidsoftware/closure-library,lucidsoftware/closure-library,teppeis/closure-library,teppeis/closure-library,google/closure-library,lucidsoftware/closure-library,teppeis/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library,lucidsoftware/closure-library,teppeis/closure-library