Issue 4125 - [emscripten] Convert filter classes to C++

compiled/RegExpFilter.h

 #pragma once
 
 #include "Filter.h"
 #include "ActiveFilter.h"
 
 enum class TrippleState {YES, NO, ANY};
 
 struct RegExpFilterData
 {
   mutable String::size_type mPatternStart;
@@ skipping 56 matching lines @@
   {
     mSitekeysStart = String::npos;
   }
 
   const DependentString GetSitekeysSource(const String& text) const
   {
     return DependentString(text, mSitekeysStart, mSitekeysEnd - mSitekeysStart);
   }
 };
 
-class RegExpFilter : public ActiveFilter, protected RegExpFilterData
+class RegExpFilter : public ActiveFilter
 {
 private:
   void ParseSitekeys(const String& sitekeys) const;
 
 protected:
+  RegExpFilterData mData;
+
   DomainMap* GetDomains() const override;
   SitekeySet* GetSitekeys() const override;
 public:
-  RegExpFilter(const String& text, const RegExpFilterData& data);
+  explicit RegExpFilter(Type type, const String& text, const RegExpFilterData& data);
   ~RegExpFilter();
   static Type Parse(DependentString& text, DependentString& error,
       RegExpFilterData& data);
   EMSCRIPTEN_KEEPALIVE static void InitJSTypes();
   static OwnedString RegExpFromSource(const String& source);
   EMSCRIPTEN_KEEPALIVE bool Matches(const String& location, int typeMask,
       DependentString& docDomain, bool thirdParty, const String& sitekey) const;
 };