Bug 911547 - make nsIContentSecurityPolicy serializable and trigger read/write from nsPrincipal. r=jst,grobinson

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extra : rebase_source : 3e1846e15538729f3c94f5c1470959b5d7b31f0f
Bug 911547 - Test CSP enforcement in session-restored documents.  r=ttaubert

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extra : rebase_source : a794cee6cc797f5acc67989bd17f755bae5ce0c3