Revert "chromeos: Move files in //ash/common to //ash, part 1"

ash/common/system/tray/tray_popup_header_button.h

Index: ash/common/system/tray/tray_popup_header_button.h
diff --git a/ash/system/tray/tray_popup_header_button.h b/ash/common/system/tray/tray_popup_header_button.h
similarity index 88%
rename from ash/system/tray/tray_popup_header_button.h
rename to ash/common/system/tray/tray_popup_header_button.h
index ad3b89b38a9412670228c99b2f38664c31ef075d..6a2ffb1b337a6947ab9d66716dabeb262188d5d7 100644
--- a/ash/system/tray/tray_popup_header_button.h
+++ b/ash/common/system/tray/tray_popup_header_button.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_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
-#define ASH_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
+#define ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
@@ -43,4 +43,4 @@ class ASH_EXPORT TrayPopupHeaderButton : public views::ToggleImageButton {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_