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

mojo/edk/test/scoped_test_dir.h

Index: mojo/edk/test/scoped_test_dir.h
diff --git a/mojo/edk/test/scoped_test_dir.h b/mojo/edk/test/scoped_test_dir.h
deleted file mode 100644
index 4db372ff3e43934b9fdba5723ce0c0cd0e3e5c47..0000000000000000000000000000000000000000
--- a/mojo/edk/test/scoped_test_dir.h
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef MOJO_EDK_TEST_SCOPED_TEST_DIR_H_
-#define MOJO_EDK_TEST_SCOPED_TEST_DIR_H_
-
-#include "base/files/scoped_temp_dir.h"
-#include "mojo/edk/util/scoped_file.h"
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojo {
-namespace test {
-
-// Creates/destroyes a temporary directory for test purposes. (Unlike
-// |base::ScopedTempDir|, this automatically creates the temporary directory.)
-class ScopedTestDir {
- public:
-  ScopedTestDir();
-  ~ScopedTestDir();
-
-  util::ScopedFILE CreateFile();
-
- private:
-  base::ScopedTempDir temp_dir_;
-
-  MOJO_DISALLOW_COPY_AND_ASSIGN(ScopedTestDir);
-};
-
-}  // namespace test
-}  // namespace mojo
-
-#endif  // MOJO_EDK_TEST_SCOPED_TEST_DIR_H_