SupervisedUserService::Delegate: provide default impls of non-required methods

chrome/browser/supervised_user/supervised_user_service.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 CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SERVICE_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 61 matching lines @@
   typedef base::Callback<void(bool)> SuccessCallback;
 
   class Delegate {
    public:
     virtual ~Delegate() {}
     // Returns true to indicate that the delegate handled the (de)activation, or
     // false to indicate that the SupervisedUserService itself should handle it.
     virtual bool SetActive(bool active) = 0;
     // Returns the path to a blacklist file to load, or an empty path to
     // indicate "none".
-    virtual base::FilePath GetBlacklistPath() const = 0;
+    virtual base::FilePath GetBlacklistPath() const;
     // Returns the URL from which to download a blacklist if no local one exists
     // yet. The blacklist file will be stored at |GetBlacklistPath()|.
-    virtual GURL GetBlacklistURL() const = 0;
+    virtual GURL GetBlacklistURL() const;
   };
 
   ~SupervisedUserService() override;
 
   // ProfileKeyedService override:
   void Shutdown() override;
 
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   void SetDelegate(Delegate* delegate);
@@ skipping 255 matching lines @@
 
   // Used to create permission requests.
   ScopedVector<PermissionRequestCreator> permissions_creators_;
 
   ObserverList<SupervisedUserServiceObserver> observer_list_;
 
   base::WeakPtrFactory<SupervisedUserService> weak_ptr_factory_;
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SERVICE_H_