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

mojo/edk/system/test/test_io_thread.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // 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"
 #include "base/location.h"
 #include "base/synchronization/waitable_event.h"
 
 namespace mojo {
+namespace system {
 namespace test {
 
 namespace {
 
 void PostTaskAndWaitHelper(base::WaitableEvent* event,
                            const base::Closure& task) {
   task.Run();
   event->Signal();
 }
 
@@ skipping 33 matching lines @@
 }
 
 void TestIOThread::PostTaskAndWait(const base::Closure& task) {
   base::WaitableEvent event(false, false);
   task_runner()->PostTask(tracked_objects::Location(),
                           base::Bind(&PostTaskAndWaitHelper, &event, task));
   event.Wait();
 }
 
 }  // namespace test
+}  // namespace system
 }  // namespace mojo