Remove legacy lex-based tokenizer (`Scanner` object) from tab auto-complete logic in fbdbg debugger
Summary: Removes the legacy lex-based tokenizer from tab auto-complete. Maintaining this old lexer/parser in addition to the one we rely heavily on is not viable long term. The next step is to expose the modern parser here or clean up the remaining dead code and not support completion.
Reviewed By: ebluestein
Differential Revision:
D33673630
fbshipit-source-id:
24b7c307e835a6bc1a979861273ea00be650246b