EDK: Move ref counting classes to mojo/edk/util.

mojo/edk/system/simple_dispatcher_unittest.cc

Index: mojo/edk/system/simple_dispatcher_unittest.cc
diff --git a/mojo/edk/system/simple_dispatcher_unittest.cc b/mojo/edk/system/simple_dispatcher_unittest.cc
index 17ae99ee95620d95a97813d46b91226cb4e24102..6fb42f6616ae994ee27db6a4d42f2cfbebdc1b87 100644
--- a/mojo/edk/system/simple_dispatcher_unittest.cc
+++ b/mojo/edk/system/simple_dispatcher_unittest.cc
@@ -13,7 +13,6 @@
 #include <vector>
 
 #include "base/logging.h"
-#include "mojo/edk/system/ref_ptr.h"
 #include "mojo/edk/system/test/sleep.h"
 #include "mojo/edk/system/test/stopwatch.h"
 #include "mojo/edk/system/test/timeouts.h"
@@ -21,9 +20,13 @@
 #include "mojo/edk/system/waiter.h"
 #include "mojo/edk/system/waiter_test_utils.h"
 #include "mojo/edk/util/make_unique.h"
+#include "mojo/edk/util/ref_ptr.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using mojo::util::MakeRefCounted;
+using mojo::util::RefPtr;
+
 namespace mojo {
 namespace system {
 namespace {