Make the default ctor of rtc::Thread, protected

webrtc/pc/peerconnectionendtoend_unittest.cc

Index: webrtc/pc/peerconnectionendtoend_unittest.cc
diff --git a/webrtc/pc/peerconnectionendtoend_unittest.cc b/webrtc/pc/peerconnectionendtoend_unittest.cc
index c83235229d7cf9cc024be2602e25055dcc440f4f..f7cd91f00ed6bdddc768a114053045e062d77bf6 100644
--- a/webrtc/pc/peerconnectionendtoend_unittest.cc
+++ b/webrtc/pc/peerconnectionendtoend_unittest.cc
@@ -54,12 +54,14 @@ class PeerConnectionEndToEndTest
       DataChannelList;
 
   PeerConnectionEndToEndTest() {
-    RTC_CHECK(network_thread_.Start());
-    RTC_CHECK(worker_thread_.Start());
+    network_thread_ = rtc::Thread::CreateWithSocketServer();
+    worker_thread_ = rtc::Thread::Create();
+    RTC_CHECK(network_thread_->Start());
+    RTC_CHECK(worker_thread_->Start());
     caller_ = new rtc::RefCountedObject<PeerConnectionTestWrapper>(
-        "caller", &network_thread_, &worker_thread_);
+        "caller", network_thread_.get(), worker_thread_.get());
     callee_ = new rtc::RefCountedObject<PeerConnectionTestWrapper>(
-        "callee", &network_thread_, &worker_thread_);
+        "callee", network_thread_.get(), worker_thread_.get());
     webrtc::PeerConnectionInterface::IceServer ice_server;
     ice_server.uri = "stun:stun.l.google.com:19302";
     config_.servers.push_back(ice_server);
@@ -165,8 +167,8 @@ class PeerConnectionEndToEndTest
   }
 
  protected:
-  rtc::Thread network_thread_;
-  rtc::Thread worker_thread_;
+  std::unique_ptr<rtc::Thread> network_thread_;
+  std::unique_ptr<rtc::Thread> worker_thread_;
   rtc::scoped_refptr<PeerConnectionTestWrapper> caller_;
   rtc::scoped_refptr<PeerConnectionTestWrapper> callee_;
   DataChannelList caller_signaled_data_channels_;