Bug 1542807 part 5 - Don't apply CSP rules for the document to fonts loaded from User and UserAgent origin sheets. r=ckerschb

As for document.fonts, I don't think we intentionally meant to apply
CSP to User/UserAgent fonts.  The document certainly has no authority
to block those from loading.  (We already have a separate principal
for these which is further evidence that this was unintentional
and we can use the same bit (mUseOriginPrincipal) to avoid CSP.)

Differential Revision: https://phabricator.services.mozilla.com/D111695

toolkit/components/extensions/webrequest/ChannelWrapper.cpp

@@ -804,6 +804,7 @@ MozContentPolicyType GetContentPolicyType(ExtContentPolicyType aType) {
     case ExtContentPolicy::TYPE_DTD:
       return MozContentPolicyType::Xml_dtd;
     case ExtContentPolicy::TYPE_FONT:
+    case ExtContentPolicy::TYPE_UA_FONT:
       return MozContentPolicyType::Font;
     case ExtContentPolicy::TYPE_MEDIA:
       return MozContentPolicyType::Media;