Remove VirtualSocketServer's dependency on PhysicalSocketServer.

webrtc/base/virtualsocket_unittest.cc

 /*
  *  Copyright 2006 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 128 matching lines @@
   size_t count;
   size_t sec_count;
   double sum;
   double sum_sq;
   uint32_t samples;
 };
 
 class VirtualSocketServerTest : public testing::Test {
  public:
   VirtualSocketServerTest()
-      : ss_(nullptr),
-        thread_(&ss_),
+      : thread_(&ss_),
         kIPv4AnyAddress(IPAddress(INADDR_ANY), 0),
         kIPv6AnyAddress(IPAddress(in6addr_any), 0) {}
 
   void CheckPortIncrementalization(const SocketAddress& post,
                                    const SocketAddress& pre) {
     EXPECT_EQ(post.port(), pre.port() + 1);
     IPAddress post_ip = post.ipaddr();
     IPAddress pre_ip = pre.ipaddr();
     EXPECT_EQ(pre_ip.family(), post_ip.family());
     if (post_ip.family() == AF_INET) {
@@ skipping 962 matching lines @@
           << " N=" << kTestSamples[sidx];
         EXPECT_NEAR(kStdDev, stddev, 0.1 * kStdDev)
           << "M=" << kTestMean[midx]
           << " SD=" << kStdDev
           << " N=" << kTestSamples[sidx];
         delete f;
       }
     }
   }
 }