Fixed typo in InterstitialDismissed method name.

ios/web/public/web_state/web_state_observer_bridge.h

 // Copyright 2015 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_WEB_PUBLIC_WEB_STATE_WEB_STATE_OBSERVER_BRIDGE_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_OBSERVER_BRIDGE_H_
 
 #import <Foundation/Foundation.h>
 
 #include <string>
@@ skipping 81 matching lines @@
   WebStateObserverBridge(web::WebState* web_state,
                          id<CRWWebStateObserver> observer);
   ~WebStateObserverBridge() override;
 
   // web::WebStateObserver methods.
   void ProvisionalNavigationStarted(const GURL& url) override;
   void NavigationItemCommitted(
       const LoadCommittedDetails& load_details) override;
   void PageLoaded(
       web::PageLoadCompletionStatus load_completion_status) override;
-  void InsterstitialDismissed() override;
+  void InterstitialDismissed() override;
   void UrlHashChanged() override;
   void HistoryStateChanged() override;
   void LoadProgressChanged(double progress) override;
   void DocumentSubmitted(const std::string& form_name,
                          bool user_initiated) override;
   void FormActivityRegistered(const std::string& form_name,
                               const std::string& field_name,
                               const std::string& type,
                               const std::string& value,
                               bool input_missing) override;
   void FaviconUrlUpdated(const std::vector<FaviconURL>& candidates) override;
   void RenderProcessGone() override;
   void WebStateDestroyed() override;
   void DidStartLoading() override;
   void DidStopLoading() override;
 
  private:
   base::WeakNSProtocol<id<CRWWebStateObserver>> observer_;
   DISALLOW_COPY_AND_ASSIGN(WebStateObserverBridge);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_OBSERVER_BRIDGE_H_