Collect some histograms about signed binary downloads.

chrome/browser/safe_browsing/safe_browsing_service.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.
 //
 // The Safe Browsing service is responsible for downloading anti-phishing and
 // anti-malware tables and checking urls against them.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_SERVICE_H_
 #define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_SERVICE_H_
 #pragma once
@@ skipping 249 matching lines @@
 
   bool download_protection_enabled() const {
     return enabled_ && enable_download_protection_;
   }
 
   safe_browsing::ClientSideDetectionService*
       safe_browsing_detection_service() const {
     return csd_service_.get();
   }
 
+  // The DownloadProtectionService is not valid after the SafeBrowsingService
+  // is destroyed.
   safe_browsing::DownloadProtectionService*
       download_protection_service() const {
     return download_service_.get();
   }
 
   // Preference handling.
   static void RegisterPrefs(PrefService* prefs);
 
   // Called on the IO thread to reset the database.
   void ResetDatabase();
@@ skipping 185 matching lines @@
   // Starts following the safe browsing preference on |pref_service|.
   void AddPrefService(PrefService* pref_service);
 
   // Stop following the safe browsing preference on |pref_service|.
   void RemovePrefService(PrefService* pref_service);
 
   // Checks if any profile is currently using the safe browsing service, and
   // starts or stops the service accordingly.
   void RefreshState();
 
+  // Arranges to delete |download_service_| on the IO thread, and sets
+  // the pointer to NULL.
+  void ShutDownDownloadService();
+
   // The factory used to instanciate a SafeBrowsingService object.
   // Useful for tests, so they can provide their own implementation of
   // SafeBrowsingService.
   static SafeBrowsingServiceFactory* factory_;
 
   CurrentChecks checks_;
 
   // Used for issuing only one GetHash request for a given prefix.
   GetHashRequests gethash_requests_;
 
@@ skipping 64 matching lines @@
 
   // Used to track creation and destruction of profiles on the UI thread.
   content::NotificationRegistrar prefs_registrar_;
 
   // The ClientSideDetectionService is managed by the SafeBrowsingService,
   // since its running state and lifecycle depends on SafeBrowsingService's.
   scoped_ptr<safe_browsing::ClientSideDetectionService> csd_service_;
 
   // The DownloadProtectionService is managed by the SafeBrowsingService,
   // since its running state and lifecycle depends on SafeBrowsingService's.
-  scoped_refptr<safe_browsing::DownloadProtectionService> download_service_;
+  scoped_ptr<safe_browsing::DownloadProtectionService> download_service_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingService);
 };
 
 // Factory for creating SafeBrowsingService.  Useful for tests.
 class SafeBrowsingServiceFactory {
  public:
   SafeBrowsingServiceFactory() { }
   virtual ~SafeBrowsingServiceFactory() { }
   virtual SafeBrowsingService* CreateSafeBrowsingService() = 0;
  private:
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_SERVICE_H_