Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

chrome/renderer/safe_browsing/phishing_classifier_delegate.h

 // Copyright (c) 2011 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.
 //
 // This class is used by the RenderView to interact with a PhishingClassifier.
 
 #ifndef CHROME_RENDERER_SAFE_BROWSING_PHISHING_CLASSIFIER_DELEGATE_H_
 #define CHROME_RENDERER_SAFE_BROWSING_PHISHING_CLASSIFIER_DELEGATE_H_
 
 #include <memory>
@@ skipping 66 matching lines @@
     SHUTDOWN,
     NEW_PHISHING_SCORER,
     CANCEL_CLASSIFICATION_MAX  // Always add new values before this one.
   };
 
   // Cancels any pending classification and frees the page text.
   void CancelPendingClassification(CancelClassificationReason reason);
 
   // RenderFrameObserver implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
+  void OnDestruct() override;
 
   // Called by the RenderFrame when it receives a StartPhishingDetection IPC
   // from the browser.  This signals that it is ok to begin classification
   // for the given toplevel URL.  If the URL has been fully loaded into the
   // RenderFrame and a Scorer has been set, this will begin classification,
   // otherwise classification will be deferred until these conditions are met.
   void OnStartPhishingDetection(const GURL& url);
 
   // Called when classification for the current page finishes.
   void ClassificationDone(const ClientPhishingRequest& verdict);
@@ skipping 38 matching lines @@
 
   // Set to true if the classifier is currently running.
   bool is_classifying_;
 
   DISALLOW_COPY_AND_ASSIGN(PhishingClassifierDelegate);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_RENDERER_SAFE_BROWSING_PHISHING_CLASSIFIER_DELEGATE_H_