Moves ash/wm/common back into ash

ash/wm/common/wm_snap_to_pixel_layout_manager.h

Index: ash/wm/common/wm_snap_to_pixel_layout_manager.h
diff --git a/ash/wm/common/wm_snap_to_pixel_layout_manager.h b/ash/wm/common/wm_snap_to_pixel_layout_manager.h
index 04c45f90827fa08b58e0e694b50dfbcfb565cf47..b5f865811b79a9889b258d614539519b3d5331fa 100644
--- a/ash/wm/common/wm_snap_to_pixel_layout_manager.h
+++ b/ash/wm/common/wm_snap_to_pixel_layout_manager.h
@@ -5,7 +5,7 @@
 #ifndef ASH_WM_COMMON_WM_SNAP_TO_PIXEL_LAYOUT_MANAGER_H_
 #define ASH_WM_COMMON_WM_SNAP_TO_PIXEL_LAYOUT_MANAGER_H_
 
-#include "ash/wm/common/ash_wm_common_export.h"
+#include "ash/ash_export.h"
 #include "ash/wm/common/wm_layout_manager.h"
 #include "base/macros.h"
 
@@ -14,7 +14,7 @@ namespace wm {
 
 // A layout manager that places children's layer at the physical pixel
 // boundaries.
-class ASH_WM_COMMON_EXPORT WmSnapToPixelLayoutManager : public WmLayoutManager {
+class ASH_EXPORT WmSnapToPixelLayoutManager : public WmLayoutManager {
  public:
   WmSnapToPixelLayoutManager();
   ~WmSnapToPixelLayoutManager() override;