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valenting authored
This patch persists the CrossOriginEmbedderPolicy on the Document and WindowContext. The WindowContext's embedder policy is set in WindowGlobalActor::BaseInitializer by either adopting the policy of the HTTP channel that loaded the document, or in WindowGlobalChild::OnNewDocument by inheriting the one from the browsingContext's windowContext. Differential Revision: https://phabricator.services.mozilla.com/D46903
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