Revert "Move mojo edk into mojo/edk"

mojo/edk/system/message_in_transit_queue.h

-// 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.
-
-#ifndef MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
-#define MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
-
-#include <deque>
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "mojo/edk/system/message_in_transit.h"
-#include "mojo/edk/system/system_impl_export.h"
-
-namespace mojo {
-namespace system {
-
-// A simple queue for |MessageInTransit|s (that owns its messages).
-// This class is not thread-safe.
-// TODO(vtl): Write tests.
-class MOJO_SYSTEM_IMPL_EXPORT MessageInTransitQueue {
- public:
-  MessageInTransitQueue();
-  ~MessageInTransitQueue();
-
-  bool IsEmpty() const { return queue_.empty(); }
-
-  void AddMessage(scoped_ptr<MessageInTransit> message) {
-    queue_.push_back(message.release());
-  }
-
-  scoped_ptr<MessageInTransit> GetMessage() {
-    MessageInTransit* rv = queue_.front();
-    queue_.pop_front();
-    return make_scoped_ptr(rv);
-  }
-
-  MessageInTransit* PeekMessage() { return queue_.front(); }
-
-  void DiscardMessage() {
-    delete queue_.front();
-    queue_.pop_front();
-  }
-
-  void Clear();
-
-  // Efficiently swaps contents with |*other|.
-  void Swap(MessageInTransitQueue* other);
-
- private:
-  // TODO(vtl): When C++11 is available, switch this to a deque of
-  // |scoped_ptr|/|unique_ptr|s.
-  std::deque<MessageInTransit*> queue_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessageInTransitQueue);
-};
-
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_