LibWeb: Remove TokenStream::position() and ::rewind_to_position()

Author: https://github.com/AtkinsSJ
Commit: 56e8e0daa1
Pull-request: https://github.com/SerenityOS/serenity/pull/13824

Userland/Libraries/LibWeb/CSS/Parser/Parser.h

@@ -104,8 +104,6 @@ public:
     void reconsume_current_input_token();
 
     StateTransaction begin_transaction() { return StateTransaction(*this); }
-    int position() const { return m_iterator_offset; }
-    void rewind_to_position(int);
 
     void skip_whitespace();