Get tests working on systems that only support IPv6.

webrtc/base/nethelpers.cc

Index: webrtc/base/nethelpers.cc
diff --git a/webrtc/base/nethelpers.cc b/webrtc/base/nethelpers.cc
index 6c2ef9c5f6bb28eb5745efaa8eb74050866d8ba2..6c11ef8c38fa04800df834bc8fa0f0f8939b3b89 100644
--- a/webrtc/base/nethelpers.cc
+++ b/webrtc/base/nethelpers.cc
@@ -141,6 +141,26 @@ int inet_pton(int af, const char* src, void *dst) {
 #endif
 }
 
+bool HasIPv4Enabled() {
+#if defined(WEBRTC_POSIX) && !defined(__native_client__)
+  bool has_ipv4 = false;
+  struct ifaddrs* ifa;
+  if (getifaddrs(&ifa) < 0) {
+    return false;
+  }
+  for (struct ifaddrs* cur = ifa; cur != nullptr; cur = cur->ifa_next) {
+    if (cur->ifa_addr->sa_family == AF_INET) {
+      has_ipv4 = true;
+      break;

[pthatcher1, 2017/05/15 21:50:31]

Why not just "freeifaddrs(ifa); return true;"?

+    }
+  }
+  freeifaddrs(ifa);
+  return has_ipv4;
+#else
+  return true;
+#endif
+}
+
 bool HasIPv6Enabled() {
 #if defined(WEBRTC_WIN)
   if (IsWindowsVistaOrLater()) {