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

ios/chrome/browser/tabs/tab.h

Index: ios/chrome/browser/tabs/tab.h
diff --git a/ios/chrome/browser/tabs/tab.h b/ios/chrome/browser/tabs/tab.h
index b108643a919d9979bae169237d4b75d97233cf34..96e137f552a671b2488002a317f5583e5e88fbaa 100644
--- a/ios/chrome/browser/tabs/tab.h
+++ b/ios/chrome/browser/tabs/tab.h
@@ -12,7 +12,6 @@
 
 #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"
 
@@ -64,6 +63,7 @@ namespace web {
 class NavigationManagerImpl;
 struct Referrer;
 class WebState;
+class WebStateImpl;
 }
 
 // Notification sent by a Tab when it starts to load a new URL. This
@@ -98,8 +98,7 @@ extern NSString* const kProxyPassthroughHeaderValue;
 // 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;
@@ -127,6 +126,10 @@ extern NSString* const kProxyPassthroughHeaderValue;
 // |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;