LibJS: Remove Value::to_deprecated_string_without_side_effects

Userland/Libraries/LibJS/Runtime/Value.cpp

@@ -395,11 +395,6 @@ ErrorOr<String> Value::to_string_without_side_effects() const
     }
 }
 
-DeprecatedString Value::to_deprecated_string_without_side_effects() const
-{
-    return MUST(to_string_without_side_effects()).to_deprecated_string();
-}
-
 ThrowCompletionOr<PrimitiveString*> Value::to_primitive_string(VM& vm)
 {
     if (is_string())

Userland/Libraries/LibJS/Runtime/Value.h

@@ -395,7 +395,6 @@ public:
     ThrowCompletionOr<FunctionObject*> get_method(VM&, PropertyKey const&) const;
 
     ErrorOr<String> to_string_without_side_effects() const;
-    DeprecatedString to_deprecated_string_without_side_effects() const;
 
     Value value_or(Value fallback) const
     {