| Index: ios/chrome/browser/tabs/tab_model_observers_bridge.mm
 | 
| diff --git a/ios/chrome/browser/tabs/tab_model_observers_bridge.mm b/ios/chrome/browser/tabs/tab_model_observers_bridge.mm
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| index 2fc02d26f9a5b88501a8fc3b45141983c32d1ffa..1d212f178e41480b7e45ff8eea221b4df9e985a7 100644
 | 
| --- a/ios/chrome/browser/tabs/tab_model_observers_bridge.mm
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| +++ b/ios/chrome/browser/tabs/tab_model_observers_bridge.mm
 | 
| @@ -96,4 +96,12 @@
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|                         atIndex:static_cast<NSUInteger>(atIndex)];
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|  }
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|  
 | 
| +- (void)webStateList:(WebStateList*)webStateList
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| +    willDetachWebState:(web::WebState*)webState
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| +               atIndex:(int)atIndex {
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| +  DCHECK_GE(atIndex, 0);
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| +  [_tabModelObservers tabModel:_tabModel
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| +                 willRemoveTab:LegacyTabHelper::GetTabForWebState(webState)];
 | 
| +}
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| +
 | 
|  @end
 | 
| 
 |