LibWasm: Remove declarations for non-existent methods

Author: https://github.com/AtkinsSJ
Commit: 8d31e04b8a
Pull-request: https://github.com/SerenityOS/serenity/pull/17203
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWasm/AbstractMachine/Validator.h

@@ -241,7 +241,6 @@ public:
     ErrorOr<void, ValidationError> validate_instruction(Instruction const&, Stack& stack, bool& is_constant);
 
     // Types
-    bool type_is_subtype_of(ValueType const& candidate_subtype, ValueType const& candidate_supertype);
     ErrorOr<void, ValidationError> validate(Limits const&, size_t k); // n <= 2^k-1 && m? <= 2^k-1
     ErrorOr<FunctionType, ValidationError> validate(BlockType const&);
     ErrorOr<void, ValidationError> validate(FunctionType const&) { return {}; }