Bug 1613609 - Add required loadinfo flag requests initiated with SystemPrincipal r=necko-reviewers,dragana

Adding the flag to existing channel/loadinfo object for:
- PushServices HTTP, WebSocket
- NetworkGeolocationProvider
- NetUtil.jsm's NewChannel
- NetworkConnectivityService
- OCSP
- Portal Detection
- ProductAddonChecker.jsm
- URLClassifier

Differential Revision: https://phabricator.services.mozilla.com/D75063

toolkit/components/url-classifier/nsUrlClassifierStreamUpdater.cpp

@@ -148,6 +148,8 @@ nsresult nsUrlClassifierStreamUpdater::FetchUpdate(
   mozilla::OriginAttributes attrs;
   attrs.mFirstPartyDomain.AssignLiteral(NECKO_SAFEBROWSING_FIRST_PARTY_DOMAIN);
   loadInfo->SetOriginAttributes(attrs);
+  // allow deprecated HTTP request from SystemPrincipal
+  loadInfo->SetAllowDeprecatedSystemRequests(true);
 
   mBeganStream = false;