Destroy the notification database when corruption occurs.

content/browser/notifications/platform_notification_context_impl.h

Index: content/browser/notifications/platform_notification_context_impl.h
diff --git a/content/browser/notifications/platform_notification_context_impl.h b/content/browser/notifications/platform_notification_context_impl.h
index 944b26a62f8cc40b3a6c8d85102b7cc78ec9355e..757d22e42b130377f72f5d10461b59cca4072186 100644
--- a/content/browser/notifications/platform_notification_context_impl.h
+++ b/content/browser/notifications/platform_notification_context_impl.h
@@ -66,6 +66,7 @@ class CONTENT_EXPORT PlatformNotificationContextImpl
   // ServiceWorkerContextObserver implementation.
   void OnRegistrationDeleted(int64_t registration_id,
                              const GURL& pattern) override;
+  void OnStorageWiped() override;
 
  private:
   friend class base::DeleteHelper<PlatformNotificationContextImpl>;
@@ -119,6 +120,11 @@ class CONTENT_EXPORT PlatformNotificationContextImpl
       const GURL& origin,
       int64_t service_worker_registration_id);
 
+  // Destroys the database regardless of its initialization status. This method
+  // must only be called on the |task_runner_| thread. Returns if the directory
+  // the database was stored in could be emptied.
+  bool DestroyDatabase();
+
   // Returns the path in which the database should be initialized. May be empty.
   base::FilePath GetDatabasePath() const;