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Minimal test - lines (32, 62)

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static void Initialize() {
  if (!gdk_display_get_default() ||
      !GDK_IS_X11_DISPLAY(gdk_display_get_default())) {
    return;
  }

  // This will leak - See comments in ~nsUserIdleServiceGTK().
  PRLibrary* xsslib = PR_LoadLibrary("libXss.so.1");
  if (!xsslib)  // ouch.
  {
    MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to find libXss.so!\n"));
    return;
  }

  _XSSQueryExtension = (_XScreenSaverQueryExtension_fn)PR_FindFunctionSymbol(
      xsslib, "XScreenSaverQueryExtension");
  _XSSAllocInfo = (_XScreenSaverAllocInfo_fn)PR_FindFunctionSymbol(
      xsslib, "XScreenSaverAllocInfo");
  _XSSQueryInfo = (_XScreenSaverQueryInfo_fn)PR_FindFunctionSymbol(
      xsslib, "XScreenSaverQueryInfo");

  if (!_XSSQueryExtension)
    MOZ_LOG(sIdleLog, LogLevel::Warning,
            ("Failed to get XSSQueryExtension!\n"));
  if (!_XSSAllocInfo)
    MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSAllocInfo!\n"));
  if (!_XSSQueryInfo)
    MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSQueryInfo!\n"));

  sInitialized = true;
}