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

mojo/edk/embedder/embedder_unittest.cc

 // Copyright 2014 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/embedder/embedder.h"
 
 #include <string.h>
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/test_timeouts.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 #include "mojo/edk/embedder/test_embedder.h"
 #include "mojo/edk/system/mutex.h"
+#include "mojo/edk/system/test/test_io_thread.h"
 #include "mojo/edk/system/test/timeouts.h"
 #include "mojo/edk/test/multiprocess_test_helper.h"
 #include "mojo/edk/test/scoped_ipc_support.h"
-#include "mojo/edk/test/test_io_thread.h"
 #include "mojo/public/c/system/core.h"
 #include "mojo/public/cpp/system/handle.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using mojo::system::test::TestIOThread;
+
 namespace mojo {
-
-using test::TestIOThread;
-
 namespace embedder {
 namespace {
 
 const MojoHandleSignals kSignalReadadableWritable =
     MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_WRITABLE;
 
 const MojoHandleSignals kSignalAll = MOJO_HANDLE_SIGNAL_READABLE |
                                      MOJO_HANDLE_SIGNAL_WRITABLE |
                                      MOJO_HANDLE_SIGNAL_PEER_CLOSED;
 
@@ skipping 735 matching lines @@
 
   EXPECT_TRUE(test::Shutdown());
 }
 
 // TODO(vtl): Test immediate write & close.
 // TODO(vtl): Test broken-connection cases.
 
 }  // namespace
 }  // namespace embedder
 }  // namespace mojo