Bug 1740163 - Fix non-unified build errors in netwerk/dns/mdns/libmdns/. r=necko-reviewers,valentin

netwerk/dns/mdns/libmdns/MDNSResponderReply.cpp:41:14: error: use of undeclared identifier 'OnSocketThread'
  MOZ_ASSERT(OnSocketThread(), "not on socket thread");

netwerk/dns/mdns/libmdns/nsDNSServiceDiscovery.cpp:30:16: error: use of undeclared identifier 'NS_IsMainThread'
  MOZ_ASSERT(NS_IsMainThread());

Differential Revision: https://phabricator.services.mozilla.com/D130718

netwerk/dns/mdns/libmdns/MDNSResponderReply.cpp

@@ -5,6 +5,7 @@
 
 #include "MDNSResponderReply.h"
 #include "mozilla/EndianUtils.h"
+#include "nsHttpHandler.h"  // for OnSocketThread()
 #include "private/pprio.h"
 
 namespace mozilla {

netwerk/dns/mdns/libmdns/moz.build

@@ -40,8 +40,8 @@ XPCOM_MANIFESTS += [
     "components.conf",
 ]
 
-XPCOM_MANIFESTS += [
-    "components.conf",
+LOCAL_INCLUDES += [
+    "/netwerk/protocol/http",  # for nsHttpHandler.h
 ]
 
 include("/ipc/chromium/chromium-config.mozbuild")

netwerk/dns/mdns/libmdns/nsDNSServiceDiscovery.cpp

@@ -4,6 +4,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "nsDNSServiceDiscovery.h"
+#include "MainThreadUtils.h"
 #include "MDNSResponderOperator.h"
 #include "nsICancelable.h"
 #include "nsXULAppAPI.h"