chromeos: Move files in //ash/common to //ash, part 2

ash/metrics/task_switch_source.h

 // Copyright 2016 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 ASH_COMMON_METRICS_TASK_SWITCH_SOURCE_H_
-#define ASH_COMMON_METRICS_TASK_SWITCH_SOURCE_H_
+#ifndef ASH_METRICS_TASK_SWITCH_SOURCE_H_
+#define ASH_METRICS_TASK_SWITCH_SOURCE_H_
 
 namespace ash {
 
 // Enumeration of the different user interfaces that could be the source of
 // a task switch. Note this is not necessarily comprehensive of all sources.
 enum class TaskSwitchSource {
   // Task switches caused by any two sources in this enum. NOTE: This value
   // should NOT be used outside of TaskSwitchMetricsRecorder.
   ANY,
   // Task switches caused by the user activating a task window by clicking or
   // tapping on it.
   DESKTOP,
   // Task switches caused by selecting a window from overview mode which is
   // different from the previously-active window.
   OVERVIEW_MODE,
   // All task switches caused by shelf buttons, not including sub-menus.
   SHELF,
   // Task switches caused by the WindowCycleController (ie Alt+Tab).
   WINDOW_CYCLE_CONTROLLER
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_METRICS_TASK_SWITCH_SOURCE_H_
+#endif  // ASH_METRICS_TASK_SWITCH_SOURCE_H_