chromeos: Make CheckIdleStateIsLocked() query D-Bus client.

chrome/browser/idle_chromeos.cc

 // Copyright (c) 2012 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 "chrome/browser/idle.h"
 
-#include "ash/session/session_state_delegate.h"
-#include "ash/shell.h"
 #include "base/time/time.h"
+#include "chromeos/dbus/dbus_thread_manager.h"

[Daniel Erat, 2015/01/13 00:04:07]

if ui/base/ shouldn't be able to depend on chromeos/, or if this code doesn't
seem like it belongs under ui/base/, i could probably also move it to
components/idle/ or something like that in the next change rather than ui/base/.

[stevenjb, 2015/01/13 17:30:12]

I have no particular problem with ui/base relying on src/chromeos. That said, we
do also have a ui/chromeos directory which already has that dependency if this
would fit nicely there.

+#include "chromeos/dbus/session_manager_client.h"
 #include "ui/base/user_activity/user_activity_detector.h"
 
 void CalculateIdleTime(IdleTimeCallback notify) {
   base::TimeDelta idle_time = base::TimeTicks::Now() -
       ui::UserActivityDetector::Get()->last_activity_time();
   notify.Run(static_cast<int>(idle_time.InSeconds()));
 }
 
 bool CheckIdleStateIsLocked() {
-#if defined(USE_ATHENA)
-  return false;
-#else
-  return ash::Shell::GetInstance()->session_state_delegate()->IsScreenLocked();
-#endif
+  return chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
+      IsScreenLocked();
 }