Replaced webControllerWebProcessDidCrash: with RenderProcessGone.

ios/web/public/web_state/web_state_observer_bridge.h

Index: ios/web/public/web_state/web_state_observer_bridge.h
diff --git a/ios/web/public/web_state/web_state_observer_bridge.h b/ios/web/public/web_state/web_state_observer_bridge.h
index 895f96a37f8a1001d19f87d7ca798f5bf8226e70..1b88355d317e080c1b71425bc684567651663204 100644
--- a/ios/web/public/web_state/web_state_observer_bridge.h
+++ b/ios/web/public/web_state/web_state_observer_bridge.h
@@ -60,6 +60,9 @@ class GURL;
     didUpdateFaviconURLCandidates:
         (const std::vector<web::FaviconURL>&)candidates;
 
+// Invoked by WebStateObserverBridge::RenderProcessGone.
+- (void)renderProcessGoneForWebState:(web::WebState*)webState;
+
 // Note: after |webStateDestroyed:| is invoked, the WebState being observed
 // is no longer valid.
 - (void)webStateDestroyed:(web::WebState*)webState;
@@ -103,6 +106,7 @@ class WebStateObserverBridge : public web::WebStateObserver {
                               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;