Revert of [ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/chrome/browser/web_state_list/web_state_list_order_controller.h

Index: ios/chrome/browser/web_state_list/web_state_list_order_controller.h
diff --git a/ios/chrome/browser/web_state_list/web_state_list_order_controller.h b/ios/chrome/browser/web_state_list/web_state_list_order_controller.h
deleted file mode 100644
index 0491002dfa170d91ad217f672d5e87318776706d..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_list_order_controller.h
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2017 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 IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_ORDER_CONTROLLER_H_
-#define IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_ORDER_CONTROLLER_H_
-
-#include "base/macros.h"
-#include "ui/base/page_transition_types.h"
-
-class WebStateList;
-
-namespace web {
-class WebState;
-}
-
-// WebStateListOrderController allows different types of ordering and
-// selection heuristics to be plugged into WebStateList.
-class WebStateListOrderController {
- public:
-  explicit WebStateListOrderController(WebStateList* web_state_list);
-  ~WebStateListOrderController();
-
-  // Determines where to place a newly opened WebState by using the supplied
-  // transition, opener and background flag.
-  int DetermineInsertionIndex(ui::PageTransition transition,
-                              web::WebState* opener) const;
-
-  // Determines where to shift the active index after a WebState is closed.
-  int DetermineNewActiveIndex(int removing_index) const;
-
- private:
-  // Returns a valid index to be selected after the WebState at |removing_index|
-  // is detached, adjusting |index| to reflect that |removing_index| is going
-  // away.
-  int GetValidIndex(int index, int removing_index) const;
-
-  WebStateList* web_state_list_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebStateListOrderController);
-};
-
-#endif  // IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_ORDER_CONTROLLER_H_