Converts overview to use common ash types

ash/metrics/user_metrics_recorder.h

 // 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.
 
 #ifndef ASH_METRICS_USER_METRICS_RECORDER_H_
 #define ASH_METRICS_USER_METRICS_RECORDER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 109 matching lines @@
   UMA_TRAY_SHUT_DOWN,
   UMA_WINDOW_APP_CLOSE_BUTTON_CLICK,
   UMA_WINDOW_CLOSE_BUTTON_CLICK,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_EXIT_FULLSCREEN,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_MAXIMIZE,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_MINIMIZE,
   UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_RESTORE,
   UMA_WINDOW_MAXIMIZE_BUTTON_MAXIMIZE_LEFT,
   UMA_WINDOW_MAXIMIZE_BUTTON_MAXIMIZE_RIGHT,
 
-  // Thumbnail sized overview of windows triggered by pressing the overview key.
-  UMA_WINDOW_OVERVIEW,

[James Cook, 2016/05/27 00:02:50]

FYI, I asked kuscher@ if we need to maintain these metrics at all. Unfortunately
we do (apparently overview mode is being tweaked soon), but there may be other
classes of metrics we can just remove. I'll follow up with him.

-
-  // User selected a window in overview mode different from the
-  // previously-active window.
-  UMA_WINDOW_OVERVIEW_ACTIVE_WINDOW_CHANGED,
-
-  // Selecting a window in overview mode by pressing the enter key.
-  UMA_WINDOW_OVERVIEW_ENTER_KEY,
-
   // Window selection started by beginning an alt+tab cycle. This does not count
   // each step through an alt+tab cycle.
   UMA_WINDOW_CYCLE,
 };
 
 // User Metrics Recorder provides a repeating callback (RecordPeriodicMetrics)
 // on a timer to allow recording of state data over time to the UMA records.
 // Any additional states (in ash) that require monitoring can be added to
 // this class. As well calls to record on action metrics
 // (RecordUserMetricsAction) are passed through the UserMetricsRecorder.
@@ skipping 49 matching lines @@
   // clicks or touchscreen taps.
   std::unique_ptr<DesktopTaskSwitchMetricRecorder>
       desktop_task_switch_metric_recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(UserMetricsRecorder);
 };
 
 }  // namespace ash
 
 #endif  // ASH_METRICS_USER_METRICS_RECORDER_H_