Refactor creation of SadTabView into a tab helper object

ios/web/public/test/fakes/test_web_state.h

 // Copyright 2014 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_TEST_FAKES_TEST_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_TEST_FAKES_TEST_WEB_STATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 35 matching lines @@
   const std::string& GetContentsMimeType() const override;
   const std::string& GetContentLanguageHeader() const override;
   bool ContentIsHTML() const override;
   const base::string16& GetTitle() const override;
   bool IsLoading() const override;
   double GetLoadingProgress() const override;
   bool IsBeingDestroyed() const override;
   const GURL& GetVisibleURL() const override;
   const GURL& GetLastCommittedURL() const override;
   GURL GetCurrentURL(URLVerificationTrustLevel* trust_level) const override;
-  void ShowTransientContentView(CRWContentView* content_view) override {}
+  void ShowTransientContentView(CRWContentView* content_view) override;
   void AddScriptCommandCallback(const ScriptCommandCallback& callback,
                                 const std::string& command_prefix) override {}
   void RemoveScriptCommandCallback(const std::string& command_prefix) override {
   }
   CRWWebViewProxyType GetWebViewProxy() const override;
   bool IsShowingWebInterstitial() const override;
   WebInterstitial* GetWebInterstitial() const override;
   void OnPasswordInputShownOnHttp() override {}
   void OnCreditCardInputShownOnHttp() override {}
 
@@ skipping 13 matching lines @@
   void SetLoading(bool is_loading);
   void SetCurrentURL(const GURL& url);
   void SetTrustLevel(URLVerificationTrustLevel trust_level);
   void SetNavigationManager(
       std::unique_ptr<NavigationManager> navigation_manager);
   void SetView(UIView* view);
 
   // Notifier for tests.
   void OnPageLoaded(PageLoadCompletionStatus load_completion_status);
   void OnProvisionalNavigationStarted(const GURL& url);
+  void OnRenderProcessGone();
 
  private:
   BrowserState* browser_state_;
   bool web_usage_enabled_;
   bool is_loading_;
   GURL url_;
   base::string16 title_;
   URLVerificationTrustLevel trust_level_;
   bool content_is_html_;
   std::string mime_type_;
   std::string content_language_;
   std::unique_ptr<NavigationManager> navigation_manager_;
   base::scoped_nsobject<UIView> view_;
 
   // A list of observers notified when page state changes. Weak references.
   base::ObserverList<WebStateObserver, true> observers_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_FAKES_TEST_WEB_STATE_H_