Revert "Revert 239730 "ash_system_tray_delegate -> system_tray_delegate_...""

chrome/browser/chromeos/system/ash_system_tray_delegate.h

Index: chrome/browser/chromeos/system/ash_system_tray_delegate.h
diff --git a/chrome/browser/chromeos/system/ash_system_tray_delegate.h b/chrome/browser/chromeos/system/ash_system_tray_delegate.h
deleted file mode 100644
index e59728ad8509f4fd5fda3bd16035a0abeb7f22f6..0000000000000000000000000000000000000000
--- a/chrome/browser/chromeos/system/ash_system_tray_delegate.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_SYSTEM_ASH_SYSTEM_TRAY_DELEGATE_H_
-#define CHROME_BROWSER_CHROMEOS_SYSTEM_ASH_SYSTEM_TRAY_DELEGATE_H_
-
-namespace ash {
-class SystemTray;
-class SystemTrayDelegate;
-}
-
-namespace chromeos {
-ash::SystemTrayDelegate* CreateSystemTrayDelegate();
-}
-
-#endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_ASH_SYSTEM_TRAY_DELEGATE_H_