Revert "Move mojo edk into mojo/edk"

mojo/edk/system/message_pipe_endpoint.cc

-// 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.
-
-#include "mojo/edk/system/message_pipe_endpoint.h"
-
-#include "base/logging.h"
-
-namespace mojo {
-namespace system {
-
-void MessagePipeEndpoint::CancelAllWaiters() {
-  NOTREACHED();
-}
-
-MojoResult MessagePipeEndpoint::ReadMessage(UserPointer<void> /*bytes*/,
-                                            UserPointer<uint32_t> /*num_bytes*/,
-                                            DispatcherVector* /*dispatchers*/,
-                                            uint32_t* /*num_dispatchers*/,
-                                            MojoReadMessageFlags /*flags*/) {
-  NOTREACHED();
-  return MOJO_RESULT_INTERNAL;
-}
-
-HandleSignalsState MessagePipeEndpoint::GetHandleSignalsState() const {
-  NOTREACHED();
-  return HandleSignalsState();
-}
-
-MojoResult MessagePipeEndpoint::AddWaiter(Waiter* /*waiter*/,
-                                          MojoHandleSignals /*signals*/,
-                                          uint32_t /*context*/,
-                                          HandleSignalsState* signals_state) {
-  NOTREACHED();
-  if (signals_state)
-    *signals_state = HandleSignalsState();
-  return MOJO_RESULT_INTERNAL;
-}
-
-void MessagePipeEndpoint::RemoveWaiter(Waiter* /*waiter*/,
-                                       HandleSignalsState* signals_state) {
-  NOTREACHED();
-  if (signals_state)
-    *signals_state = HandleSignalsState();
-}
-
-void MessagePipeEndpoint::Attach(ChannelEndpoint* /*channel_endpoint*/) {
-  NOTREACHED();
-}
-
-}  // namespace system
-}  // namespace mojo