Issue 5201 - [emscripten] Replace EM_ASM calls by a custom JavaScript library

compiled/FilterNotifier.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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #pragma once
 
 #include <cstdio>
 
+#include "library.h"
 #include "String.h"
 
 class Filter;
 class Subscription;
 
 namespace FilterNotifier
 {
   enum class Topic
   {
     NONE,
@@ skipping 21 matching lines @@
     printf("  [%i, 'subscription.disabled'],\n", Topic::SUBSCRIPTION_DISABLED);
     printf("  [%i, 'subscription.fixedTitle'],\n", Topic::SUBSCRIPTION_FIXEDTITLE);
     printf("  [%i, 'subscription.homepage'],\n", Topic::SUBSCRIPTION_HOMEPAGE);
     printf("  [%i, 'subscription.lastCheck'],\n", Topic::SUBSCRIPTION_LASTCHECK);
     printf("  [%i, 'subscription.lastDownload'],\n", Topic::SUBSCRIPTION_LASTDOWNLOAD);
     printf("  [%i, 'subscription.downloadStatus'],\n", Topic::SUBSCRIPTION_DOWNLOADSTATUS);
     printf("  [%i, 'subscription.errors'],\n", Topic::SUBSCRIPTION_ERRORS);
     printf("]);");
   }
 
-  extern "C" {
-    void JSNotifyFilterChange(Topic topic, Filter* filter);
-    void JSNotifySubscriptionChange(Topic topic,
-        Subscription* subscription);
-  }
-
   inline void FilterChange(Topic topic, Filter* filter)
   {
     JSNotifyFilterChange(topic, filter);
   }
 
   inline void SubscriptionChange(Topic topic, Subscription* subscription)
   {
     JSNotifySubscriptionChange(topic, subscription);
   }
 }