Bug 1045902: CSP - log warning and ignore 'reflected-xss' directive (r=grobinson)

--HG--
extra : rebase_source : 9625060894079debd9cee8bc50bdc3b3be1ee18f
Bug 1045902: CSP - test 'reflected-xss' directive logs message to the console (r=grobinson)

--HG--
extra : rebase_source : 55fc9a7ffd038c1a2dfa67b017df33ae13c4c6e7