Revert "Move mojo edk into mojo/edk"

mojo/edk/system/waiter_list.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_WAITER_LIST_H_
-#define MOJO_EDK_SYSTEM_WAITER_LIST_H_
-
-#include <stdint.h>
-
-#include <list>
-
-#include "base/macros.h"
-#include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/c/system/types.h"
-
-namespace mojo {
-namespace system {
-
-class Waiter;
-struct HandleSignalsState;
-
-// |WaiterList| tracks all the |Waiter|s that are waiting on a given
-// handle/|Dispatcher|. There should be a |WaiterList| for each handle that can
-// be waited on (in any way). In the simple case, the |WaiterList| is owned by
-// the |Dispatcher|, whereas in more complex cases it is owned by the secondary
-// object (see simple_dispatcher.* and the explanatory comment in core.cc). This
-// class is thread-unsafe (all concurrent access must be protected by some
-// lock).
-class MOJO_SYSTEM_IMPL_EXPORT WaiterList {
- public:
-  WaiterList();
-  ~WaiterList();
-
-  void AwakeWaitersForStateChange(const HandleSignalsState& state);
-  void CancelAllWaiters();
-  void AddWaiter(Waiter* waiter, MojoHandleSignals signals, uint32_t context);
-  void RemoveWaiter(Waiter* waiter);
-
- private:
-  struct WaiterInfo {
-    WaiterInfo(Waiter* waiter, MojoHandleSignals signals, uint32_t context)
-        : waiter(waiter), signals(signals), context(context) {}
-
-    Waiter* waiter;
-    MojoHandleSignals signals;
-    uint32_t context;
-  };
-  typedef std::list<WaiterInfo> WaiterInfoList;
-
-  WaiterInfoList waiters_;
-
-  DISALLOW_COPY_AND_ASSIGN(WaiterList);
-};
-
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_WAITER_LIST_H_