Moves ash/wm/common back into ash

ash/wm/common/ash_wm_common_export.h

Index: ash/wm/common/ash_wm_common_export.h
diff --git a/ash/wm/common/ash_wm_common_export.h b/ash/wm/common/ash_wm_common_export.h
deleted file mode 100644
index a6263504bf4e5c362a7f5c287beb0920a62eb6c3..0000000000000000000000000000000000000000
--- a/ash/wm/common/ash_wm_common_export.h
+++ /dev/null
@@ -1,32 +0,0 @@
-// 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_ASH_WM_COMMON_EXPORT_H_
-#define ASH_WM_COMMON_ASH_WM_COMMON_EXPORT_H_
-
-// Defines ASH_WM_COMMON_EXPORT so that functionality implemented by the Ash
-// module can be exported to consumers.
-
-#if defined(COMPONENT_BUILD)
-#if defined(WIN32)
-
-#if defined(ASH_WM_COMMON_IMPLEMENTATION)
-#define ASH_WM_COMMON_EXPORT __declspec(dllexport)
-#else
-#define ASH_WM_COMMON_EXPORT __declspec(dllimport)
-#endif  // defined(ASH_WM_COMMON_IMPLEMENTATION)
-
-#else  // defined(WIN32)
-#if defined(ASH_WM_COMMON_IMPLEMENTATION)
-#define ASH_WM_COMMON_EXPORT __attribute__((visibility("default")))
-#else
-#define ASH_WM_COMMON_EXPORT
-#endif
-#endif
-
-#else  // defined(COMPONENT_BUILD)
-#define ASH_WM_COMMON_EXPORT
-#endif
-
-#endif  // ASH_WM_COMMON_ASH_WM_COMMON_EXPORT_H_