If network enumeration fails, try binding to the "ANY" address.

webrtc/p2p/client/basicportallocator.cc

Index: webrtc/p2p/client/basicportallocator.cc
diff --git a/webrtc/p2p/client/basicportallocator.cc b/webrtc/p2p/client/basicportallocator.cc
index dbac0d3822ee08cc6453bf382bffd4aa9bf8c0f9..664701e100deb0eede31d8596b5dc7f5f524a731 100644
--- a/webrtc/p2p/client/basicportallocator.cc
+++ b/webrtc/p2p/client/basicportallocator.cc
@@ -551,6 +551,12 @@ std::vector<rtc::Network*> BasicPortAllocatorSession::GetNetworks() {
     network_manager->GetAnyAddressNetworks(&networks);
   } else {
     network_manager->GetNetworks(&networks);
+    // If network enumeration fails, use the ANY address as a fallback, so we
+    // can at least try gathering candidates using the default route chosen by
+    // the OS.
+    if (networks.empty()) {
+      network_manager->GetAnyAddressNetworks(&networks);
+    }
   }
   networks.erase(std::remove_if(networks.begin(), networks.end(),
                                 [this](rtc::Network* network) {