Move mojo edk into mojo/edk

mojo/edk/test/BUILD.gn

 # 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.
 
-# GYP version: mojo/mojo_public_tests.gypi:mojo_public_test_utils
-source_set("test_utils") {
+# GYP version: mojo/mojo_base.gyp:mojo_common_test_support
+source_set("test_support") {
   testonly = true
+  sources = [
+    "multiprocess_test_helper.cc",
+    "multiprocess_test_helper.h",
+    "test_utils.h",
+    "test_utils_posix.cc",
+    "test_utils_win.cc",
+  ]
+
   deps = [
     "//base",
-    "//mojo/public/c/test_support",
-    "//mojo/public/cpp/system",
+    "//base/test:test_support",
+    "//mojo/edk/system",
     "//testing/gtest",
   ]
-
-  sources = [
-    "lib/test_support.cc",
-    "lib/test_utils.cc",
-    "test_utils.h",
-  ]
 }