Mojo: Move waiting APIs to public library

mojo/edk/system/data_pipe_unittest.cc

 // Copyright 2015 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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 #include "mojo/edk/system/test_utils.h"
-#include "mojo/edk/system/waiter.h"
 #include "mojo/edk/test/mojo_test_base.h"
 #include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/c/system/functions.h"
 #include "mojo/public/c/system/message_pipe.h"
 #include "mojo/public/cpp/system/simple_watcher.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace edk {
 namespace {
@@ skipping 1996 matching lines @@
     for (size_t i = 3; i < 6; ++i)
       CloseHandle(producers[i]);
   END_CHILD()
 }
 
 #endif  // !defined(OS_IOS)
 
 }  // namespace
 }  // namespace edk
 }  // namespace mojo