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

ios/chrome/browser/web_state_list/web_state_list.h

Index: ios/chrome/browser/web_state_list/web_state_list.h
diff --git a/ios/chrome/browser/web_state_list/web_state_list.h b/ios/chrome/browser/web_state_list/web_state_list.h
deleted file mode 100644
index f87064d8ff6416a9daac2e32ac195958a9cc1ba9..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_list.h
+++ /dev/null
@@ -1,162 +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_H_
-#define IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_H_
-
-#include <memory>
-#include <vector>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "ui/base/page_transition_types.h"
-
-class WebStateListDelegate;
-class WebStateListObserver;
-class WebStateListOrderController;
-struct WebStateOpener;
-
-namespace web {
-class WebState;
-}
-
-// Manages a list of WebStates.
-class WebStateList {
- public:
-  explicit WebStateList(WebStateListDelegate* delegate);
-  ~WebStateList();
-
-  // Returns whether the model is empty or not.
-  bool empty() const { return web_state_wrappers_.empty(); }
-
-  // Returns the number of WebStates in the model.
-  int count() const { return static_cast<int>(web_state_wrappers_.size()); }
-
-  // Returns the index of the currently active WebState, or kInvalidIndex if
-  // there are no active WebState.
-  int active_index() const { return active_index_; }
-
-  // Returns true if the specified index is contained by the model.
-  bool ContainsIndex(int index) const;
-
-  // Returns the currently active WebState or null if there is none.
-  web::WebState* GetActiveWebState() const;
-
-  // Returns the WebState at the specified index. It is invalid to call this
-  // with an index such that |ContainsIndex(index)| returns false.
-  web::WebState* GetWebStateAt(int index) const;
-
-  // Returns the index of the specified WebState or kInvalidIndex if the
-  // WebState is not in the model.
-  int GetIndexOfWebState(const web::WebState* web_state) const;
-
-  // Returns information about the opener of the WebState at the specified
-  // index. The structure |opener| will be null if there is no opener.
-  WebStateOpener GetOpenerOfWebStateAt(int index) const;
-
-  // Stores information about the opener of the WebState at the specified
-  // index. The WebStateOpener |opener| must be non-null and the WebState
-  // must be in WebStateList.
-  void SetOpenerOfWebStateAt(int index, WebStateOpener opener);
-
-  // Returns the index of the next WebState in the sequence of WebStates opened
-  // from the specified WebState after |start_index|, or kInvalidIndex if there
-  // are no such WebState. If |use_group| is true, the opener's navigation index
-  // is used to detect navigation changes within the same session.
-  int GetIndexOfNextWebStateOpenedBy(const web::WebState* opener,
-                                     int start_index,
-                                     bool use_group) const;
-
-  // Returns the index of the last WebState in the sequence of WebStates opened
-  // from the specified WebState after |start_index|, or kInvalidIndex if there
-  // are no such WebState. If |use_group| is true, the opener's navigation index
-  // is used to detect navigation changes within the same session.
-  int GetIndexOfLastWebStateOpenedBy(const web::WebState* opener,
-                                     int start_index,
-                                     bool use_group) const;
-
-  // Inserts the specified WebState at the specified index.
-  void InsertWebState(int index, std::unique_ptr<web::WebState> web_state);
-
-  // Inserts the specified WebState at the best position in the WebStateList
-  // given the specified transition, opener, etc. It defaults to inserting the
-  // WebState at the end of the list.
-  void AppendWebState(ui::PageTransition transition,
-                      std::unique_ptr<web::WebState> web_state,
-                      WebStateOpener opener);
-
-  // Moves the WebState at the specified index to another index.
-  void MoveWebStateAt(int from_index, int to_index);
-
-  // Replaces the WebState at the specified index with new WebState. Returns
-  // the old WebState at that index to the caller (abandon ownership of the
-  // returned WebState).
-  std::unique_ptr<web::WebState> ReplaceWebStateAt(
-      int index,
-      std::unique_ptr<web::WebState> web_state);
-
-  // Detaches the WebState at the specified index. Returns the detached WebState
-  // to the caller (abandon ownership of the returned WebState).
-  std::unique_ptr<web::WebState> DetachWebStateAt(int index);
-
-  // Closes and destroys the WebState at the specified index.
-  void CloseWebStateAt(int index);
-
-  // Closes and destroys all WebStates.
-  void CloseAllWebStates();
-
-  // Makes the WebState at the specified index the active WebState.
-  void ActivateWebStateAt(int index);
-
-  // Adds an observer to the model.
-  void AddObserver(WebStateListObserver* observer);
-
-  // Removes an observer from the model.
-  void RemoveObserver(WebStateListObserver* observer);
-
-  // Invalid index.
-  static const int kInvalidIndex = -1;
-
- private:
-  class WebStateWrapper;
-
-  // Sets the opener of any WebState that reference the WebState at the
-  // specified index to null.
-  void ClearOpenersReferencing(int index);
-
-  // Notify the observers if the active WebState change.
-  void NotifyIfActiveWebStateChanged(web::WebState* old_web_state,
-                                     bool user_action);
-
-  // Returns the index of the |n|-th WebState (with n > 0) in the sequence of
-  // WebStates opened from the specified WebState after |start_index|, or
-  // kInvalidIndex if there are no such WebState. If |use_group| is true, the
-  // opener's navigation index is used to detect navigation changes within the
-  // same session.
-  int GetIndexOfNthWebStateOpenedBy(const web::WebState* opener,
-                                    int start_index,
-                                    bool use_group,
-                                    int n) const;
-
-  // The WebStateList delegate.
-  WebStateListDelegate* delegate_;
-
-  // Wrappers to the WebStates hosted by the WebStateList.
-  std::vector<std::unique_ptr<WebStateWrapper>> web_state_wrappers_;
-
-  // An object that determines where new WebState should be inserted and where
-  // selection should move when a WebState is detached.
-  std::unique_ptr<WebStateListOrderController> order_controller_;
-
-  // List of observers notified of changes to the model.
-  base::ObserverList<WebStateListObserver, true> observers_;
-
-  // Index of the currently active WebState, kInvalidIndex if no such WebState.
-  int active_index_ = kInvalidIndex;
-
-  DISALLOW_COPY_AND_ASSIGN(WebStateList);
-};
-
-#endif  // IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_H_