Partial Reland of Make the default ctor of rtc::Thread, protected

webrtc/rtc_base/logging_unittest.cc

Index: webrtc/rtc_base/logging_unittest.cc
diff --git a/webrtc/rtc_base/logging_unittest.cc b/webrtc/rtc_base/logging_unittest.cc
index 5e7f67c598bf66cb2b902d87cfc9210f0fc3a4e9..c80607772056bd975d7b31e4985ca2d845a6eff7 100644
--- a/webrtc/rtc_base/logging_unittest.cc
+++ b/webrtc/rtc_base/logging_unittest.cc
@@ -8,9 +8,10 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/rtc_base/logging.h"
 #include "webrtc/rtc_base/fileutils.h"
 #include "webrtc/rtc_base/gunit.h"
+#include "webrtc/rtc_base/logging.h"
+#include "webrtc/rtc_base/nullsocketserver.h"
 #include "webrtc/rtc_base/pathutils.h"
 #include "webrtc/rtc_base/stream.h"
 #include "webrtc/rtc_base/thread.h"
@@ -88,6 +89,8 @@ TEST(LogTest, MultipleStreams) {
 // We should restore the correct global state at the end.
 class LogThread : public Thread {
  public:
+  LogThread() : Thread(std::unique_ptr<SocketServer>(new NullSocketServer())) {}
+
   ~LogThread() override {
     Stop();
   }