Bug 1549405 - Use LOAD_BYPASS_URL_ClASSIFIER flag for TRR request. r=…

…valentin

We should add LOAD_BYPASS_URL_ClASSIFIER to TRR request because if
"network.trr.mode" is set to 3, blocked TRR request means DNS resolution
fail, we don't fall back to regular DNS in this scenario.

Differential Revision: https://phabricator.services.mozilla.com/D30085

--HG--
extra : moz-landing-system : lando

netwerk/dns/TRR.cpp

@@ -240,7 +240,8 @@ nsresult TRR::SendHTTPRequest() {
       nullptr,  // PerformanceStorage
       nullptr,  // aLoadGroup
       this,
-      nsIRequest::LOAD_ANONYMOUS | (mPB ? nsIRequest::INHIBIT_CACHING : 0),
+      nsIRequest::LOAD_ANONYMOUS | (mPB ? nsIRequest::INHIBIT_CACHING : 0) |
+          nsIChannel::LOAD_BYPASS_URL_CLASSIFIER,
       ios);
   if (NS_FAILED(rv)) {
     LOG(("TRR:SendHTTPRequest: NewChannel failed!\n"));