Issue 5063 - [emscripten] Make FilterNotifier calls more efficient

compiled/subscription/Subscription.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 20 matching lines @@
       field_type name;\
     public:\
       param_type EMSCRIPTEN_KEEPALIVE getter() const\
       {\
         return name;\
       }\
       void EMSCRIPTEN_KEEPALIVE setter(param_type value)\
       {\
         if (name != value)\
         {\
-          field_type oldvalue = name;\
           name = value;\
           if (FilterNotifier::Topic::topic != FilterNotifier::Topic::NONE)\
           {\
-            FilterNotifier::PropertyChange(FilterNotifier::Topic::topic,\
-                this, value, oldvalue);\
+            FilterNotifier::SubscriptionChange(FilterNotifier::Topic::topic,\
+                this);\
           }\
         }\
       }
 
 #define SUBSCRIPTION_PROPERTY(type, name, topic, getter, setter) \
     static_assert(std::is_arithmetic<type>::value, "SUBSCRIPTION_PROPERTY macro can only be used with arithmetic types");\
     SUBSCRIPTION_PROPERTY_INTERNAL(type, type, name, topic, getter, setter)
 
 #define SUBSCRIPTION_STRING_PROPERTY(name, topic, getter, setter) \
     SUBSCRIPTION_PROPERTY_INTERNAL(OwnedString, const String&, name, topic, getter, setter)
@@ skipping 33 matching lines @@
 
   EMSCRIPTEN_KEEPALIVE Filter* FilterAt(unsigned index);
   EMSCRIPTEN_KEEPALIVE int IndexOfFilter(Filter* filter);
   EMSCRIPTEN_KEEPALIVE OwnedString Serialize() const;
   EMSCRIPTEN_KEEPALIVE OwnedString SerializeFilters() const;
 
   static EMSCRIPTEN_KEEPALIVE Subscription* FromID(const String& id);
 };
 
 typedef intrusive_ptr<Subscription> SubscriptionPtr;