LibWeb: Remove friend class declarations from HTMLToken

Since all interaction with the HTMLToken class now happens over getters
and setters, there is no more need for HTMLTokenizer and
HTMLDocumentParser to have direct access to the members.

Userland/Libraries/LibWeb/HTML/Parser/HTMLToken.h

@@ -19,8 +19,6 @@ namespace Web::HTML {
 class HTMLTokenizer;
 
 class HTMLToken {
-    friend class HTMLDocumentParser;
-    friend class HTMLTokenizer;
 
 public:
     enum class Type {