Moves common code in ash/wm/overview to ash/common/wm/overview

ash/common/wm/overview/window_grid.h

Index: ash/common/wm/overview/window_grid.h
diff --git a/ash/wm/overview/window_grid.h b/ash/common/wm/overview/window_grid.h
similarity index 97%
rename from ash/wm/overview/window_grid.h
rename to ash/common/wm/overview/window_grid.h
index 7b61bb291908492914befcae442f15ae6725f1b2..9a3202713b1ca00068b75b07b4e43f7736490e9c 100644
--- a/ash/wm/overview/window_grid.h
+++ b/ash/common/wm/overview/window_grid.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_WM_OVERVIEW_WINDOW_GRID_H_
-#define ASH_WM_OVERVIEW_WINDOW_GRID_H_
+#ifndef ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_
+#define ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_
 
 #include <stddef.h>
 
@@ -11,8 +11,8 @@
 #include <set>
 #include <vector>
 
+#include "ash/common/wm/overview/window_selector.h"
 #include "ash/common/wm_window_observer.h"
-#include "ash/wm/overview/window_selector.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 
@@ -180,4 +180,4 @@ class ASH_EXPORT WindowGrid : public WmWindowObserver {
 
 }  // namespace ash
 
-#endif  // ASH_WM_OVERVIEW_WINDOW_GRID_H_
+#endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_