Remove unnecessary #includes in system_tray.cc and tray_user_unittest.cc.

ash/system/user/tray_user_unittest.cc

 // 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.
 
 #include <vector>
 
-#include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/session/user_info.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/user/tray_user.h"
 #include "ash/system/user/tray_user_separator.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/test_session_state_delegate.h"
 #include "ash/test/test_shell_delegate.h"
-#include "base/command_line.h"
 #include "ui/aura/test/event_generator.h"
 #include "ui/gfx/animation/animation_container_element.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 class TrayUserTest : public ash::test::AshTestBase {
  public:
   TrayUserTest();
@@ skipping 213 matching lines @@
   EXPECT_EQ(active_user->GetUserID(), second_user->GetUserID());
   // Since the name is capitalized, the email should be different then the
   // user_id.
   EXPECT_NE(active_user->GetUserID(), second_user->GetEmail());
   tray()->CloseSystemBubble();
 }
 
 #endif
 
 }  // namespace ash