[LukaAl]

No, as they explain, the feature in stable is behind the status in Canary: https://bugs.chromium.org/p/chromium/issues/detail?id=326539...

[anamexis]

I am running normal Chrome on Mac (Version 49.0.2623.87) and the feature flag is there under chrome://flags/

[ihuman]

As LukeAl said in the post you are commenting on, the stable version's native notification feature is 6-12 weeks behind Canary's (which the chromium.org update is talking about).