Move scoped_test_dir.* and test_io_thread.* from edk/test to edk/system/test.

mojo/edk/system/test/test_io_thread.cc

Index: mojo/edk/system/test/test_io_thread.cc
diff --git a/mojo/edk/test/test_io_thread.cc b/mojo/edk/system/test/test_io_thread.cc
similarity index 94%
rename from mojo/edk/test/test_io_thread.cc
rename to mojo/edk/system/test/test_io_thread.cc
index b8b4745057a2e484b2202c967b7ae3d8559c2287..ee11ff3f94fdb7c10460642292c7433df84ea25f 100644
--- a/mojo/edk/test/test_io_thread.cc
+++ b/mojo/edk/system/test/test_io_thread.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mojo/edk/test/test_io_thread.h"
+#include "mojo/edk/system/test/test_io_thread.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ -10,6 +10,7 @@
 #include "base/synchronization/waitable_event.h"
 
 namespace mojo {
+namespace system {
 namespace test {
 
 namespace {
@@ -63,4 +64,5 @@ void TestIOThread::PostTaskAndWait(const base::Closure& task) {
 }
 
 }  // namespace test
+}  // namespace system
 }  // namespace mojo