Revert "Move mojo edk into mojo/edk"

mojo/edk/system/test_utils.h

-// Copyright 2013 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.
-
-#ifndef MOJO_EDK_SYSTEM_TEST_UTILS_H_
-#define MOJO_EDK_SYSTEM_TEST_UTILS_H_
-
-#include <stdint.h>
-
-#include "base/callback_forward.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/task_runner.h"
-#include "base/threading/thread.h"
-#include "base/time/time.h"
-
-namespace tracked_objects {
-class Location;
-}
-
-namespace mojo {
-namespace system {
-namespace test {
-
-// Posts the given task (to the given task runner) and waits for it to complete.
-// (Note: Doesn't spin the current thread's message loop, so if you're careless
-// this could easily deadlock.)
-void PostTaskAndWait(scoped_refptr<base::TaskRunner> task_runner,
-                     const tracked_objects::Location& from_here,
-                     const base::Closure& task);
-
-// A timeout smaller than |TestTimeouts::tiny_timeout()|. Warning: This may lead
-// to flakiness, but this is unavoidable if, e.g., you're trying to ensure that
-// functions with timeouts are reasonably accurate. We want this to be as small
-// as possible without causing too much flakiness.
-base::TimeDelta EpsilonTimeout();
-
-// Stopwatch -------------------------------------------------------------------
-
-// A simple "stopwatch" for measuring time elapsed from a given starting point.
-class Stopwatch {
- public:
-  Stopwatch() {}
-  ~Stopwatch() {}
-
-  void Start() { start_time_ = base::TimeTicks::Now(); }
-
-  base::TimeDelta Elapsed() { return base::TimeTicks::Now() - start_time_; }
-
- private:
-  base::TimeTicks start_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(Stopwatch);
-};
-
-}  // namespace test
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_TEST_UTILS_H_