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

mojo/edk/system/platform_handle_dispatcher_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/system/platform_handle_dispatcher.h"
 
 #include <stdio.h>
 
 #include "base/memory/ref_counted.h"
-#include "mojo/edk/test/scoped_test_dir.h"
+#include "mojo/edk/system/test/scoped_test_dir.h"
 #include "mojo/edk/test/test_utils.h"
 #include "mojo/edk/util/scoped_file.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace system {
 namespace {
 
 TEST(PlatformHandleDispatcherTest, Basic) {
-  mojo::test::ScopedTestDir test_dir;
+  test::ScopedTestDir test_dir;
 
   static const char kHelloWorld[] = "hello world";
 
   util::ScopedFILE fp(test_dir.CreateFile());
   ASSERT_TRUE(fp);
   EXPECT_EQ(sizeof(kHelloWorld),
             fwrite(kHelloWorld, 1, sizeof(kHelloWorld), fp.get()));
 
   embedder::ScopedPlatformHandle h(
       mojo::test::PlatformHandleFromFILE(fp.Pass()));
@@ skipping 18 matching lines @@
   EXPECT_STREQ(kHelloWorld, read_buffer);
 
   // Try getting the handle again. (It should fail cleanly.)
   h = dispatcher->PassPlatformHandle().Pass();
   EXPECT_FALSE(h.is_valid());
 
   EXPECT_EQ(MOJO_RESULT_OK, dispatcher->Close());
 }
 
 TEST(PlatformHandleDispatcherTest, CreateEquivalentDispatcherAndClose) {
-  mojo::test::ScopedTestDir test_dir;
+  test::ScopedTestDir test_dir;
 
   static const char kFooBar[] = "foo bar";
 
   util::ScopedFILE fp(test_dir.CreateFile());
   EXPECT_EQ(sizeof(kFooBar), fwrite(kFooBar, 1, sizeof(kFooBar), fp.get()));
 
   auto dispatcher = PlatformHandleDispatcher::Create(
       mojo::test::PlatformHandleFromFILE(fp.Pass()));
 
   DispatcherTransport transport(
@@ skipping 22 matching lines @@
   EXPECT_EQ(sizeof(kFooBar),
             fread(read_buffer, 1, sizeof(read_buffer), fp.get()));
   EXPECT_STREQ(kFooBar, read_buffer);
 
   EXPECT_EQ(MOJO_RESULT_OK, dispatcher->Close());
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo