Revert of WebStateList is an array of web::WebState* wrappers.

ios/chrome/browser/tabs/tab.h

 // Copyright 2012 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_H_
 #define IOS_CHROME_BROWSER_TABS_TAB_H_
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
 #include <vector>
 
 #import "components/signin/ios/browser/manage_accounts_delegate.h"
 #include "ios/net/request_tracker.h"
-#import "ios/shared/chrome/browser/tabs/web_state_handle.h"
 #import "ios/web/public/web_state/ui/crw_web_delegate.h"
 #include "ui/base/page_transition_types.h"
 
 @class AutofillController;
 @class AutoReloadBridge;
 @class CastController;
 @protocol CRWNativeContentProvider;
 @class CRWSessionEntry;
 @class CRWWebController;
 @class ExternalAppLauncher;
@@ skipping 31 matching lines @@
 
 namespace sessions {
 class SerializedNavigationEntry;
 struct SessionTab;
 }
 
 namespace web {
 class NavigationManagerImpl;
 struct Referrer;
 class WebState;
+class WebStateImpl;
 }
 
 // Notification sent by a Tab when it starts to load a new URL. This
 // notification must only be used for crash reporting as it is also sent for
 // pre-rendered tabs.
 extern NSString* const kTabUrlStartedLoadingNotificationForCrashReporting;
 
 // Notification sent by a Tab when it is likely about to start loading a new
 // URL. This notification must only be used for crash reporting as it is also
 // sent for pre-rendered tabs.
@@ skipping 14 matching lines @@
 
 // The header name and value for the data reduction proxy to request an image to
 // be reloaded without optimizations.
 extern NSString* const kProxyPassthroughHeaderName;
 extern NSString* const kProxyPassthroughHeaderValue;
 
 // Information related to a single tab. The CRWWebController is similar to
 // desktop Chrome's TabContents in that it encapsulates rendering. Acts as the
 // delegate for the CRWWebController in order to process info about pages having
 // loaded.
-@interface Tab
-    : NSObject<CRWWebDelegate, ManageAccountsDelegate, WebStateHandle>
+@interface Tab : NSObject<CRWWebDelegate, ManageAccountsDelegate>
 
 // Browser state associated with this Tab.
 @property(nonatomic, readonly) ios::ChromeBrowserState* browserState;
 
 // TODO(crbug.com/546208): Eliminate this; replace calls with either visible URL
 // or last committed URL, depending on the specific use case.
 // Do not add new calls to this method.
 @property(nonatomic, readonly) const GURL& url;
 
 // The Passkit Dialog provider used to show the UI to download a passkit object.
 @property(nonatomic, assign) id<PassKitDialogProvider> passKitDialogProvider;
 
 // The current title of the tab.
 @property(nonatomic, readonly) NSString* title;
 
 // Original page title or nil if the page did not provide one.
 @property(nonatomic, readonly) NSString* originalTitle;
 
 @property(nonatomic, readonly) NSString* urlDisplayString;
 @property(nonatomic, readonly) NSString* windowName;
 
 // ID associated with this tab, from the SessionManager.
 @property(nonatomic, readonly) NSString* tabId;
 
 // |YES| if snapshot overlay should load from the grey image cache.
 @property(nonatomic, assign) BOOL useGreyImageCache;
 
+// webStateImpl is deprecated: use webState instead.
+@property(nonatomic, readonly) web::WebStateImpl* webStateImpl;
+@property(nonatomic, readonly) web::WebState* webState;
+
 @property(nonatomic, readonly) CRWWebController* webController;
 @property(nonatomic, readonly) PasswordController* passwordController;
 @property(nonatomic, readonly) BOOL canGoBack;
 @property(nonatomic, readonly) BOOL canGoForward;
 @property(nonatomic, assign) id<TabDelegate> delegate;
 @property(nonatomic, assign) id<TabHeadersDelegate> tabHeadersDelegate;
 @property(nonatomic, assign) id<TabSnapshottingDelegate>
     tabSnapshottingDelegate;
 @property(nonatomic, readonly) BOOL useDesktopUserAgent;
 @property(nonatomic, assign) id<StoreKitLauncher> storeKitLauncher;
@@ skipping 195 matching lines @@
 
 // Called when this tab is hidden.
 - (void)wasHidden;
 
 // Evaluates U2F result.
 - (void)evaluateU2FResultFromURL:(const GURL&)url;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_TABS_TAB_H_