mash: Move SystemTrayDelegate and dependencies to //ash/common

ash/common/system/networking_config_delegate.h

 // Copyright 2015 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_NETWORKING_CONFIG_DELEGATE_H_
-#define ASH_NETWORKING_CONFIG_DELEGATE_H_
+#ifndef ASH_COMMON_SYSTEM_NETWORKING_CONFIG_DELEGATE_H_
+#define ASH_COMMON_SYSTEM_NETWORKING_CONFIG_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
 
 namespace ash {
 
 // This delegate allows the UI code in ash, e.g. |NetworkStateListDetailedView|,
@@ skipping 18 matching lines @@
   // scoped_ptr is empty.
   virtual std::unique_ptr<const ExtensionInfo> LookUpExtensionForNetwork(
       const std::string& service_path) = 0;
 
  private:
   DISALLOW_ASSIGN(NetworkingConfigDelegate);
 };
 
 }  // namespace ash
 
-#endif  // ASH_NETWORKING_CONFIG_DELEGATE_H_
+#endif  // ASH_COMMON_SYSTEM_NETWORKING_CONFIG_DELEGATE_H_