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

ios/chrome/browser/tabs/tab_model_closing_web_state_observer.h

 // 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_TABS_TAB_MODEL_CLOSING_WEB_STATE_OBSERVER_H_
 #define IOS_CHROME_BROWSER_TABS_TAB_MODEL_CLOSING_WEB_STATE_OBSERVER_H_
 
 #import <Foundation/Foundation.h>
 
-#import "ios/shared/chrome/browser/tabs/web_state_list_observer_bridge.h"
+#import "ios/chrome/browser/web_state_list/web_state_list_observer_bridge.h"
 
 @class TabModel;
 namespace sessions {
 class TabRestoreService;
 }
 
 // Observes WebStateList events about closing WebState.
 @interface TabModelClosingWebStateObserver : NSObject<WebStateListObserving>
 
 - (instancetype)initWithTabModel:(TabModel*)tabModel
                   restoreService:(sessions::TabRestoreService*)restoreService
     NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_MODEL_CLOSING_WEB_STATE_OBSERVER_H_