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

ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h

Index: ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h
diff --git a/ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h b/ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h
deleted file mode 100644
index ccdcbbb4e66b5e8fc7e1c9f84012a98697f0a997..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h
+++ /dev/null
@@ -1,108 +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_OBSERVER_BRIDGE_H_
-#define IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_OBSERVER_BRIDGE_H_
-
-#import <Foundation/Foundation.h>
-
-#include "base/macros.h"
-#import "ios/chrome/browser/web_state_list/web_state_list_observer.h"
-
-// Protocol that correspond to WebStateListObserver API. Allows registering
-// Objective-C objects to listen to WebStateList events.
-@protocol WebStateListObserving<NSObject>
-
-@optional
-
-// Invoked after a new WebState has been added to the WebStateList at the
-// specified index.
-- (void)webStateList:(WebStateList*)webStateList
-    didInsertWebState:(web::WebState*)webState
-              atIndex:(int)index;
-
-// Invoked after the WebState at the specified index is moved to another index.
-- (void)webStateList:(WebStateList*)webStateList
-     didMoveWebState:(web::WebState*)webState
-           fromIndex:(int)fromIndex
-             toIndex:(int)toIndex;
-
-// Invoked after the WebState at the specified index is replaced by another
-// WebState.
-- (void)webStateList:(WebStateList*)webStateList
-    didReplaceWebState:(web::WebState*)oldWebState
-          withWebState:(web::WebState*)newWebState
-               atIndex:(int)atIndex;
-
-// Invoked before the specified WebState is detached from the WebStateList.
-// The WebState is still valid and still in the WebStateList.
-- (void)webStateList:(WebStateList*)webStateList
-    willDetachWebState:(web::WebState*)webState
-               atIndex:(int)atIndex;
-
-// Invoked after the WebState at the specified index has been detached. The
-// WebState is still valid but is no longer in the WebStateList.
-- (void)webStateList:(WebStateList*)webStateList
-    didDetachWebState:(web::WebState*)webState
-              atIndex:(int)atIndex;
-
-// Invoked before the specified WebState is destroyed via the WebStateList.
-// The WebState is still valid but is no longer in the WebStateList.
-- (void)webStateList:(WebStateList*)webStateList
-    willCloseWebState:(web::WebState*)webState
-              atIndex:(int)atIndex;
-
-// Invoked after |newWebState| was activated at the specified index. Both
-// WebState are either valid or null (if there was no selection or there is
-// no selection). If the change is due to an user action, |userAction| will
-// be true.
-- (void)webStateList:(WebStateList*)webStateList
-    didChangeActiveWebState:(web::WebState*)newWebState
-                oldWebState:(web::WebState*)oldWebState
-                    atIndex:(int)atIndex
-                 userAction:(BOOL)userAction;
-
-@end
-
-// Observer that bridges WebStateList events to an Objective-C observer that
-// implements the WebStateListObserver protocol (the observer is owned).
-class WebStateListObserverBridge : public WebStateListObserver {
- public:
-  explicit WebStateListObserverBridge(id<WebStateListObserving> observer);
-  ~WebStateListObserverBridge() override;
-
- private:
-  // WebStateListObserver implementation.
-  void WebStateInsertedAt(WebStateList* web_state_list,
-                          web::WebState* web_state,
-                          int index) override;
-  void WebStateMoved(WebStateList* web_state_list,
-                     web::WebState* web_state,
-                     int from_index,
-                     int to_index) override;
-  void WebStateReplacedAt(WebStateList* web_state_list,
-                          web::WebState* old_web_state,
-                          web::WebState* new_web_state,
-                          int index) override;
-  void WillDetachWebStateAt(WebStateList* web_state_list,
-                            web::WebState* web_state,
-                            int index) override;
-  void WebStateDetachedAt(WebStateList* web_state_list,
-                          web::WebState* web_state,
-                          int index) override;
-  void WillCloseWebStateAt(WebStateList* web_state_list,
-                           web::WebState* web_state,
-                           int index) override;
-  void WebStateActivatedAt(WebStateList* web_state_list,
-                           web::WebState* old_web_state,
-                           web::WebState* new_web_state,
-                           int active_index,
-                           bool user_action) override;
-
-  id<WebStateListObserving> observer_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebStateListObserverBridge);
-};
-
-#endif  // IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_OBSERVER_BRIDGE_H_