Remove implicit conversions from scoped_refptr to T* in sandbox/

This patch was generated by running the rewrite_scoped_refptr clang tool
on a Linux build.

BUG=110610

Review URL: https://codereview.chromium.org/467183005

Cr-Commit-Position: refs/heads/master@{#292052}

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));

sandbox/linux/bpf_dsl/cons_unittest.cc

@@ -13,7 +13,7 @@ namespace {
 
 std::string Join(Cons<char>::List char_list) {
   std::string res;
-  for (Cons<char>::List it = char_list; it; it = it->tail()) {
+  for (Cons<char>::List it = char_list; it.get(); it = it->tail()) {
     res.push_back(it->head());
   }
   return res;