Bug 1907590: Improve labels for https telemetry, r=freddyb,kershaw,necko-reviewers,maltejur

Differential Revision: https://phabricator.services.mozilla.com/D216675

netwerk/protocol/http/HttpBaseChannel.cpp

@@ -2304,6 +2304,11 @@ HttpBaseChannel::UpgradeToSecure() {
   NS_ENSURE_TRUE(LoadUpgradableToSecure(), NS_ERROR_NOT_AVAILABLE);
 
   StoreUpgradeToSecure(true);
+  // todo: Currently UpgradeToSecure() is called only by web extensions, if
+  // that ever changes, we need to update the following telemetry collection
+  // to reflect any future changes.
+  mLoadInfo->SetHttpsUpgradeTelemetry(nsILoadInfo::WEB_EXTENSION_UPGRADE);
+
   return NS_OK;
 }