Revert of Make the default ctor of rtc::Thread, protected

webrtc/pc/rtcstats_integrationtest.cc

Index: webrtc/pc/rtcstats_integrationtest.cc
diff --git a/webrtc/pc/rtcstats_integrationtest.cc b/webrtc/pc/rtcstats_integrationtest.cc
index 3dffb8d7139257d3af0774ab8196b065c9b0ad52..3d1e7d66ea50fe947d25aa7b3c709df3ca3badc6 100644
--- a/webrtc/pc/rtcstats_integrationtest.cc
+++ b/webrtc/pc/rtcstats_integrationtest.cc
@@ -34,15 +34,14 @@
 class RTCStatsIntegrationTest : public testing::Test {
  public:
   RTCStatsIntegrationTest()
-      : network_thread_(new rtc::Thread(&virtual_socket_server_)),
-        worker_thread_(rtc::Thread::Create()) {
-    RTC_CHECK(network_thread_->Start());
-    RTC_CHECK(worker_thread_->Start());
+      : network_thread_(&virtual_socket_server_), worker_thread_() {
+    RTC_CHECK(network_thread_.Start());
+    RTC_CHECK(worker_thread_.Start());
 
     caller_ = new rtc::RefCountedObject<PeerConnectionTestWrapper>(
-        "caller", network_thread_.get(), worker_thread_.get());
+        "caller", &network_thread_, &worker_thread_);
     callee_ = new rtc::RefCountedObject<PeerConnectionTestWrapper>(
-        "callee", network_thread_.get(), worker_thread_.get());
+        "callee", &network_thread_, &worker_thread_);
   }
 
   void StartCall() {
@@ -97,8 +96,8 @@
   // |network_thread_| uses |virtual_socket_server_| so they must be
   // constructed/destructed in the correct order.
   rtc::VirtualSocketServer virtual_socket_server_;
-  std::unique_ptr<rtc::Thread> network_thread_;
-  std::unique_ptr<rtc::Thread> worker_thread_;
+  rtc::Thread network_thread_;
+  rtc::Thread worker_thread_;
   rtc::scoped_refptr<PeerConnectionTestWrapper> caller_;
   rtc::scoped_refptr<PeerConnectionTestWrapper> callee_;
 };