Remove implicit conversions from scoped_refptr to T* in sandbox/

sandbox/linux/bpf_dsl/bpf_dsl.cc

Index: sandbox/linux/bpf_dsl/bpf_dsl.cc
diff --git a/sandbox/linux/bpf_dsl/bpf_dsl.cc b/sandbox/linux/bpf_dsl/bpf_dsl.cc
index 66cd09c22027902a5e7d4ed057a24d0883911365..e9057aed43613deeea283e007c9f4abbc8a86ce5 100644
--- a/sandbox/linux/bpf_dsl/bpf_dsl.cc
+++ b/sandbox/linux/bpf_dsl/bpf_dsl.cc
@@ -248,7 +248,7 @@ ResultExpr Elser::Else(ResultExpr else_result) const {
   // and end up with an appropriately chained tree.
 
   ResultExpr expr = else_result;
-  for (Cons<Clause>::List it = clause_list_; it; it = it->tail()) {
+  for (Cons<Clause>::List it = clause_list_; it.get(); it = it->tail()) {
     Clause clause = it->head();
     expr = ResultExpr(
         new const IfThenResultExprImpl(clause.first, clause.second, expr));