message: Update peerconnection example to not use Win32SocketServer
  Cr-Commit-Position: refs/heads/master@{#34399}
diff: #include "rtc_base/ssl_adapter.h"
  #include "rtc_base/string_utils.h" // For ToUtf8
  #include "rtc_base/win32_socket_init.h"
  -#include "rtc_base/win32_socket_server.h"
  #include "system_wrappers/include/field_trial.h"
  #include "test/field_trial.h"
  @@ -76,9 +75,8 @@ int PASCAL wWinMain(HINSTANCE instance,
  wchar_t* cmd_line,
  int cmd_show) {
  rtc::WinsockInitializer winsock_init;
  - rtc::Win32SocketServer w32_ss;
  - rtc::Win32Thread w32_thread(&w32_ss);
  - rtc::ThreadManager::Instance()->SetCurrentThread(&w32_thread);
  + rtc::PhysicalSocketServer ss;
  + rtc::AutoSocketServerThread main_thread(&ss);
  WindowsCommandLineArguments win_args;
  int argc = win_args.argc();
  