Update VirtualSocketServerTest to use a fake clock.

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index 83cb750dd22039d88eaebdf21c03963adf6a4135..b5b12d4bd20776fbde22173bb8c21fb59b6d12d7 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -516,9 +516,6 @@ rtc_static_library("rtc_base") {
       "optionsfile.h",
       "rollingaccumulator.h",
       "sslroots.h",
-      "testbase64.h",
-      "testclient.cc",
-      "testclient.h",
       "transformadapter.cc",
       "transformadapter.h",
       "window.h",
@@ -691,6 +688,8 @@ rtc_source_set("rtc_base_tests_utils") {
     "sigslottester.h",
     "sigslottester.h.pump",
     "testbase64.h",
+    "testclient.cc",
+    "testclient.h",
     "testechoserver.h",
     "testutils.h",
     "timedelta.h",
@@ -758,7 +757,6 @@ if (rtc_include_tests) {
       "socket_unittest.cc",
       "socket_unittest.h",
       "socketaddress_unittest.cc",
-      "virtualsocket_unittest.cc",
     ]
     deps = [
       ":rtc_base",
@@ -827,6 +825,7 @@ if (rtc_include_tests) {
       "thread_checker_unittest.cc",
       "timestampaligner_unittest.cc",
       "timeutils_unittest.cc",
+      "virtualsocket_unittest.cc",
     ]
     deps = [
       ":rtc_base",