Revert "Move mojo edk into mojo/edk"

mojo/edk/system/simple_dispatcher.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/simple_dispatcher.h"
-
-#include "base/logging.h"
-
-namespace mojo {
-namespace system {
-
-SimpleDispatcher::SimpleDispatcher() {
-}
-
-SimpleDispatcher::~SimpleDispatcher() {
-}
-
-void SimpleDispatcher::HandleSignalsStateChangedNoLock() {
-  lock().AssertAcquired();
-  waiter_list_.AwakeWaitersForStateChange(GetHandleSignalsStateImplNoLock());
-}
-
-void SimpleDispatcher::CancelAllWaitersNoLock() {
-  lock().AssertAcquired();
-  waiter_list_.CancelAllWaiters();
-}
-
-MojoResult SimpleDispatcher::AddWaiterImplNoLock(
-    Waiter* waiter,
-    MojoHandleSignals signals,
-    uint32_t context,
-    HandleSignalsState* signals_state) {
-  lock().AssertAcquired();
-
-  HandleSignalsState state(GetHandleSignalsStateImplNoLock());
-  if (state.satisfies(signals)) {
-    if (signals_state)
-      *signals_state = state;
-    return MOJO_RESULT_ALREADY_EXISTS;
-  }
-  if (!state.can_satisfy(signals)) {
-    if (signals_state)
-      *signals_state = state;
-    return MOJO_RESULT_FAILED_PRECONDITION;
-  }
-
-  waiter_list_.AddWaiter(waiter, signals, context);
-  return MOJO_RESULT_OK;
-}
-
-void SimpleDispatcher::RemoveWaiterImplNoLock(
-    Waiter* waiter,
-    HandleSignalsState* signals_state) {
-  lock().AssertAcquired();
-  waiter_list_.RemoveWaiter(waiter);
-  if (signals_state)
-    *signals_state = GetHandleSignalsStateImplNoLock();
-}
-
-}  // namespace system
-}  // namespace mojo