chromeos: Use stl utilities from the base namespace

chromeos/system/name_value_pairs_parser.cc

Index: chromeos/system/name_value_pairs_parser.cc
diff --git a/chromeos/system/name_value_pairs_parser.cc b/chromeos/system/name_value_pairs_parser.cc
index 2bf34b682f1b7d9fba88974fd1a3dacb023374d0..d037aa80d7e64a44979afb4598f9c5448519da41 100644
--- a/chromeos/system/name_value_pairs_parser.cc
+++ b/chromeos/system/name_value_pairs_parser.cc
@@ -48,7 +48,7 @@ NameValuePairsParser::NameValuePairsParser(NameValueMap* map)
 
 void NameValuePairsParser::AddNameValuePair(const std::string& key,
                                             const std::string& value) {
-  if (!ContainsKey(*map_, key)) {
+  if (!base::ContainsKey(*map_, key)) {
     (*map_)[key] = value;
     VLOG(1) << "name: " << key << ", value: " << value;
   } else {