Kernel: Remove declarations for non-existent methods

Author: https://github.com/AtkinsSJ
Commit: 3cbc0fdbb0
Pull-request: https://github.com/SerenityOS/serenity/pull/17203
Reviewed-by: https://github.com/linusg ✅

Kernel/TTY/VirtualConsole.h

@@ -121,14 +121,10 @@ private:
 
     void clear();
 
-    void inject_string(StringView);
-
     Cell& cell_at(size_t column, size_t row);
 
     using ParamVector = Vector<unsigned, 4>;
 
-    void on_code_point(u32);
-
     void scroll_down(u16 region_top, u16 region_bottom, size_t count);
     void scroll_up(u16 region_top, u16 region_bottom, size_t count);
     void scroll_left(u16 row, u16 column, size_t count);