mash: Migrate ShelfButton* to wm common types

ash/common/shelf/shelf_button_pressed_metric_tracker.h

Index: ash/common/shelf/shelf_button_pressed_metric_tracker.h
diff --git a/ash/shelf/shelf_button_pressed_metric_tracker.h b/ash/common/shelf/shelf_button_pressed_metric_tracker.h
similarity index 93%
rename from ash/shelf/shelf_button_pressed_metric_tracker.h
rename to ash/common/shelf/shelf_button_pressed_metric_tracker.h
index fe59047b726cc6bec3216fa7fd7d82c6640d8a4a..0b8accd0f70fb4b49c311df46b0642d879254e38 100644
--- a/ash/shelf/shelf_button_pressed_metric_tracker.h
+++ b/ash/common/shelf/shelf_button_pressed_metric_tracker.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SHELF_SHELF_BUTTON_PRESSED_METRIC_TRACKER_H_
-#define ASH_SHELF_SHELF_BUTTON_PRESSED_METRIC_TRACKER_H_
+#ifndef ASH_COMMON_SHELF_SHELF_BUTTON_PRESSED_METRIC_TRACKER_H_
+#define ASH_COMMON_SHELF_SHELF_BUTTON_PRESSED_METRIC_TRACKER_H_
 
 #include <memory>
 
@@ -89,4 +89,4 @@ class ASH_EXPORT ShelfButtonPressedMetricTracker {
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_BUTTON_PRESSED_METRIC_TRACKER_H_
+#endif  // ASH_COMMON_SHELF_SHELF_BUTTON_PRESSED_METRIC_TRACKER_H_