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

ash/test/test_system_tray_delegate.h

 // Copyright 2013 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_TEST_TEST_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_TEST_TEST_SYSTEM_TRAY_DELEGATE_H_
 
-#include "ash/system/tray/default_system_tray_delegate.h"
+#include "ash/common/system/tray/default_system_tray_delegate.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 
 namespace ash {
 namespace test {
 
 class TestSystemTrayDelegate : public DefaultSystemTrayDelegate {
  public:
   TestSystemTrayDelegate();
   ~TestSystemTrayDelegate() override;
@@ skipping 37 matching lines @@
   base::TimeDelta session_length_limit_;
   bool session_length_limit_set_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSystemTrayDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SYSTEM_TRAY_DELEGATE_H_