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

compiled/filter/InvalidFilter.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 "Filter.h"
+#include "../bindings/runtime.h"
 
 class InvalidFilter : public Filter
 {
 public:
   explicit InvalidFilter(const String& text, const String& reason);
-  EMSCRIPTEN_KEEPALIVE const String& GetReason() const
+  BINDINGS_EXPORTED const String& GetReason() const
   {
     return mReason;
   };
 private:
   OwnedString mReason;
 };