Use FileDescriptorWatcher in base::TestLauncher.

base/test/launcher/test_launcher_nacl_nonsfi.cc

Index: base/test/launcher/test_launcher_nacl_nonsfi.cc
diff --git a/base/test/launcher/test_launcher_nacl_nonsfi.cc b/base/test/launcher/test_launcher_nacl_nonsfi.cc
index cf6bd94c8dc03ee882a7ec6b928b319e4c7646aa..d456ba26c72435686b0fe9c294f22d9b1eae7a9f 100644
--- a/base/test/launcher/test_launcher_nacl_nonsfi.cc
+++ b/base/test/launcher/test_launcher_nacl_nonsfi.cc
@@ -21,6 +21,11 @@
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_switches.h"
 #include "base/test/test_timeouts.h"
+#include "build/build_config.h"
+
+#if defined(OS_POSIX)
+#include "base/files/file_descriptor_watcher_posix.h"
+#endif
 
 namespace base {
 
@@ -139,6 +144,9 @@ int TestLauncherNonSfiMain(const std::string& test_binary) {
   TestTimeouts::Initialize();
 
   base::MessageLoopForIO message_loop;
+#if defined(OS_POSIX)
+  FileDescriptorWatcher file_descriptor_watcher(&message_loop);
+#endif
 
   NonSfiUnitTestPlatformDelegate platform_delegate;
   if (!platform_delegate.Init(test_binary)) {