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

mojo/edk/system/data_pipe_impl_unittest.cc

Index: mojo/edk/system/data_pipe_impl_unittest.cc
diff --git a/mojo/edk/system/data_pipe_impl_unittest.cc b/mojo/edk/system/data_pipe_impl_unittest.cc
index 5fbd20e1b0d6b5c35f27ec5f15e8f4dc375009c5..52fa27bd6f2509cc405fc70124f31ae35bc45231 100644
--- a/mojo/edk/system/data_pipe_impl_unittest.cc
+++ b/mojo/edk/system/data_pipe_impl_unittest.cc
@@ -25,14 +25,17 @@
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/message_pipe.h"
 #include "mojo/edk/system/raw_channel.h"
-#include "mojo/edk/system/ref_ptr.h"
 #include "mojo/edk/system/test/sleep.h"
 #include "mojo/edk/system/test/test_io_thread.h"
 #include "mojo/edk/system/test/timeouts.h"
 #include "mojo/edk/system/waiter.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 {