Makes ash/wm/common a library

ash/wm/common/workspace/workspace_layout_manager_delegate.h

 // Copyright 2016 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_WM_COMMON_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_DELEGATE_H_
 #define ASH_WM_COMMON_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_DELEGATE_H_
 
-#include "ash/ash_export.h"
+#include "ash/wm/common/ash_wm_common_export.h"
 
 namespace ash {
 namespace wm {
 
-class ASH_EXPORT WorkspaceLayoutManagerDelegate {
+class ASH_WM_COMMON_EXPORT WorkspaceLayoutManagerDelegate {
  public:
   virtual ~WorkspaceLayoutManagerDelegate() {}
 
   // Called when the visibility of the shelf needs to be updated.
   virtual void UpdateShelfVisibility() = 0;
 
   // Called when the fullscreen state has changed to |is_fullscreen|.
   virtual void OnFullscreenStateChanged(bool is_fullscreen) = 0;
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_DELEGATE_H_