Issue 5013 - Mark more method as const

include/AdblockPlus/FilterEngine.h

Index: include/AdblockPlus/FilterEngine.h
===================================================================
--- a/include/AdblockPlus/FilterEngine.h
+++ b/include/AdblockPlus/FilterEngine.h
@@ -337,17 +337,17 @@
      */
     std::string GetAAUrl() const;
 
     /**
      * Invokes the listener set via SetNotificationAvailableCallback() with the
      * next notification to be shown.
      * @param url URL to match notifications to (optional).
      */
-    void ShowNextNotification(const std::string& url = std::string());
+    void ShowNextNotification(const std::string& url = std::string()) const;
 
     /**
      * Sets the callback invoked when a notification should be shown.
      * @param callback Callback to invoke.
      */
     void SetShowNotificationCallback(const ShowNotificationCallback& value);
 
     /**
@@ -529,22 +529,22 @@
     int updateCheckId;
     static const std::map<ContentType, std::string> contentTypes;
 
     explicit FilterEngine(const JsEnginePtr& jsEngine);
 
     FilterPtr CheckFilterMatch(const std::string& url,
                                ContentTypeMask contentTypeMask,
                                const std::string& documentUrl) const;
-    void UpdateAvailable(UpdateAvailableCallback callback, JsValueList& params);
+    void UpdateAvailable(UpdateAvailableCallback callback, JsValueList& params) const;
     void UpdateCheckDone(const std::string& eventName,
                          UpdateCheckDoneCallback callback, JsValueList& params);
-    void FilterChanged(FilterChangeCallback callback, JsValueList& params);
+    void FilterChanged(FilterChangeCallback callback, JsValueList& params) const;
     void ShowNotification(const ShowNotificationCallback& callback,
-      const JsValueList& params);
+      const JsValueList& params) const;
     FilterPtr GetWhitelistingFilter(const std::string& url,
       ContentTypeMask contentTypeMask, const std::string& documentUrl) const;
     FilterPtr GetWhitelistingFilter(const std::string& url,
       ContentTypeMask contentTypeMask,
       const std::vector<std::string>& documentUrls) const;
   };
 }