Disabling TestUdpIPv6 on Linux

BUG=webrtc:4923, 522036
NOTRY=true

Review URL: https://codereview.webrtc.org/1298363002

Cr-Commit-Position: refs/heads/master@{#9734}
diff --git a/webrtc/base/testclient_unittest.cc b/webrtc/base/testclient_unittest.cc
index 1cb9a1a..17bf4e6 100644
--- a/webrtc/base/testclient_unittest.cc
+++ b/webrtc/base/testclient_unittest.cc
@@ -56,7 +56,12 @@
   TestUdpInternal(SocketAddress("127.0.0.1", 0));
 }
 
-TEST(TestClientTest, TestUdpIPv6) {
+#if defined(WEBRTC_LINUX)
+#define MAYBE_TestUdpIPv6 DISABLED_TestUdpIPv6
+#else
+#define MAYBE_TestUdpIPv6 TestUdpIPv6
+#endif
+TEST(TestClientTest, MAYBE_TestUdpIPv6) {
   if (HasIPv6Enabled()) {
     TestUdpInternal(SocketAddress("::1", 0));
   } else {
@@ -69,7 +74,12 @@
   TestTcpInternal(SocketAddress("127.0.0.1", 0));
 }
 
-TEST(TestClientTest, TestTcpIPv6) {
+#if defined(WEBRTC_LINUX)
+#define MAYBE_TestTcpIPv6 DISABLED_TestTcpIPv6
+#else
+#define MAYBE_TestTcpIPv6 TestTcpIPv6
+#endif
+TEST(TestClientTest, MAYBE_TestTcpIPv6) {
   if (HasIPv6Enabled()) {
     TestTcpInternal(SocketAddress("::1", 0));
   } else {