Revert "Move mojo edk into mojo/edk"

mojo/edk/system/run_all_unittests.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 "base/bind.h"
-#include "base/test/launcher/unit_test_launcher.h"
-#include "base/test/test_suite.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-int main(int argc, char** argv) {
-  // Silence death test thread warnings on Linux. We can afford to run our death
-  // tests a little more slowly (< 10 ms per death test on a Z620).
-  testing::GTEST_FLAG(death_test_style) = "threadsafe";
-
-  base::TestSuite test_suite(argc, argv);
-
-  return base::LaunchUnitTests(
-      argc,
-      argv,
-      base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
-}