[ios] Automatically fail any WebTest whose render process crashes.

ios/web/web_state/global_web_state_event_tracker.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_WEB_STATE_GLOBAL_WEB_STATE_EVENT_TRACKER_H_
 #define IOS_WEB_WEB_STATE_GLOBAL_WEB_STATE_EVENT_TRACKER_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 28 matching lines @@
 
   // Forward to the registered observers.
   void NavigationItemsPruned(WebState* web_state, size_t pruned_item_count);
   void NavigationItemChanged(WebState* web_state);
   void NavigationItemCommitted(WebState* web_state,
                                const LoadCommittedDetails& load_details);
   void WebStateDidStartLoading(WebState* web_state);
   void WebStateDidStopLoading(WebState* web_state);
   void PageLoaded(WebState* web_state,
                   PageLoadCompletionStatus load_completion_status);
+  void RenderProcessGone(WebState* web_state);
   void WebStateDestroyed(WebState* web_state);
 
   GlobalWebStateEventTracker();
   ~GlobalWebStateEventTracker();
 
   // List of observers currently registered with the tracker.
   base::ObserverList<GlobalWebStateObserver, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(GlobalWebStateEventTracker);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_GLOBAL_WEB_STATE_EVENT_TRACKER_H_