Issue 5131 - [emscripten] Clean separation of bindings code and runtime code

compiled/bindings/generator.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 175 matching lines @@
   {
     TYPEID id;
     TYPEID baseClass;
     std::string name;
     std::vector<PropertyInfo> properties;
     std::vector<MethodInfo> methods;
     DifferentiatorInfo subclass_differentiator;
     ptrdiff_t ref_counted_offset;
   };
 
-  typedef std::function<void()>  CustomGenerator;
-
   void register_class(const char* name, TYPEID classID, TYPEID baseClassID,
                       ptrdiff_t ref_counted_offset);
 
   void register_property(TYPEID classID, const char* name,
       const FunctionInfo& getter, const FunctionInfo& setter,
       const char* jsValue = "");
 
   void register_method(TYPEID classID, const char* name,
       const FunctionInfo& call);
 
@@ skipping 86 matching lines @@
     std::vector<std::pair<int, std::string>> mapping;
     for (const auto& item : list)
       mapping.emplace_back(item.first, item.second);
 
     bindings_internal::register_differentiator(
         bindings_internal::TypeInfo<ClassType>(), offset, mapping);
     return *this;
   }
 };
 
-void custom_generator(bindings_internal::CustomGenerator generator);
-
 void printBindings();