Pascal Birchler 146e6665c8 Update/Install: Reject invalid messages in the Shiny Updates postMessage handler.
This prevents conflicts with third-party messages (e.g. sent by browser extensions). The updates script expects a specific JSON-encoded message and now bails early if it's not valid JSON.

Fixes #37125.

git-svn-id: https://develop.svn.wordpress.org/trunk@37976 602fd350-edb4-49c9-b593-d223f7449a82
2016-07-05 16:15:04 +00:00
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