LibWeb: Break friendship between CSS Number and Tokenizer

Author: https://github.com/AtkinsSJ
Commit: 7128e8e2e6
Pull-request: https://github.com/SerenityOS/serenity/pull/13643

Userland/Libraries/LibWeb/CSS/Number.h

@@ -7,14 +7,11 @@
 #pragma once
 
 #include <AK/Types.h>
-#include <LibWeb/Forward.h>
 #include <math.h>
 
 namespace Web::CSS {
 
 class Number {
-    friend class Parser::Tokenizer;
-
 public:
     enum class Type {
         Number,