Issue 5063 - [emscripten] Make FilterNotifier calls more efficient

compiled/filter/ActiveFilter.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 17 matching lines @@
       type name;\
     public:\
       type EMSCRIPTEN_KEEPALIVE getter() const\
       {\
         return name;\
       }\
       void EMSCRIPTEN_KEEPALIVE setter(type value)\
       {\
         if (name != value)\
         {\
-          type oldvalue = name;\
           name = value;\
           if (FilterNotifier::Topic::topic != FilterNotifier::Topic::NONE)\
           {\
-            FilterNotifier::PropertyChange(FilterNotifier::Topic::topic,\
-                this, value, oldvalue);\
+            FilterNotifier::FilterChange(FilterNotifier::Topic::topic, this);\
           }\
         }\
       }
 
 class ActiveFilter : public Filter
 {
 protected:
   typedef StringMap<bool> DomainMap;
   typedef StringSet SitekeySet;
   void ParseDomains(const String& domains, String::value_type separator) const;
@@ skipping 10 matching lines @@
   FILTER_PROPERTY(unsigned int, mHitCount, FILTER_HITCOUNT,
       GetHitCount, SetHitCount);
   FILTER_PROPERTY(unsigned int, mLastHit, FILTER_LASTHIT,
       GetLastHit, SetLastHit);
   bool EMSCRIPTEN_KEEPALIVE IsActiveOnDomain(DependentString& docDomain,
       const String& sitekey) const;
   bool EMSCRIPTEN_KEEPALIVE IsActiveOnlyOnDomain(DependentString& docDomain) const;
   bool EMSCRIPTEN_KEEPALIVE IsGeneric() const;
   OwnedString EMSCRIPTEN_KEEPALIVE Serialize() const;
 };