SetCustomReferrerURL() sets the PP_URLREQUESTPROPERTY_CUSTOMREFERRERURL (corresponding to a string of type PP_VARTYPE_STRING or might be set to undefined as PP_VARTYPE_UNDEFINED ). Set it to a string to set a custom referrer (if empty, the referrer header will be omitted), or to undefined to use the default referrer. Only loaders with universal access (only av
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