Moves ash/wm/common back into ash

ash/wm/common/window_positioner.h

Index: ash/wm/common/window_positioner.h
diff --git a/ash/wm/common/window_positioner.h b/ash/wm/common/window_positioner.h
index 917eff50f7fb9538bfcaeeb1cdb75b6ff228a7a3..7b5219899fd66a2dd9ac71e5695bc17e6054a0ec 100644
--- a/ash/wm/common/window_positioner.h
+++ b/ash/wm/common/window_positioner.h
@@ -5,7 +5,7 @@
 #ifndef ASH_WM_COMMON_WINDOW_POSITIONER_H_
 #define ASH_WM_COMMON_WINDOW_POSITIONER_H_
 
-#include "ash/wm/common/ash_wm_common_export.h"
+#include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/base/ui_base_types.h"
 
@@ -29,7 +29,7 @@ class WindowPositionerTest;
 
 // WindowPositioner is used by the browser to move new popups automatically to
 // a usable position on the closest work area (of the active window).
-class ASH_WM_COMMON_EXPORT WindowPositioner {
+class ASH_EXPORT WindowPositioner {
  public:
   // When the screen resolution width is smaller then this size, The algorithm
   // will default to maximized.