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

mojo/edk/system/platform_handle_dispatcher_unittest.cc

Index: mojo/edk/system/platform_handle_dispatcher_unittest.cc
diff --git a/mojo/edk/system/platform_handle_dispatcher_unittest.cc b/mojo/edk/system/platform_handle_dispatcher_unittest.cc
index 7d70d75fe90229397a330fe0711f6f34b7f3a26d..1681979be0f762c3ab8ca6f96577702731e65b08 100644
--- a/mojo/edk/system/platform_handle_dispatcher_unittest.cc
+++ b/mojo/edk/system/platform_handle_dispatcher_unittest.cc
@@ -7,7 +7,7 @@
 #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"
@@ -17,7 +17,7 @@ namespace system {
 namespace {
 
 TEST(PlatformHandleDispatcherTest, Basic) {
-  mojo::test::ScopedTestDir test_dir;
+  test::ScopedTestDir test_dir;
 
   static const char kHelloWorld[] = "hello world";
 
@@ -56,7 +56,7 @@ TEST(PlatformHandleDispatcherTest, Basic) {
 }
 
 TEST(PlatformHandleDispatcherTest, CreateEquivalentDispatcherAndClose) {
-  mojo::test::ScopedTestDir test_dir;
+  test::ScopedTestDir test_dir;
 
   static const char kFooBar[] = "foo bar";