Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

components/url_matcher/url_matcher_factory.cc

Index: components/url_matcher/url_matcher_factory.cc
diff --git a/components/url_matcher/url_matcher_factory.cc b/components/url_matcher/url_matcher_factory.cc
index e7ce483cd025fe32fec90543d86b53a4dbad4509..848e5d469396040fed208f4664e97ca3ada2edd7 100644
--- a/components/url_matcher/url_matcher_factory.cc
+++ b/components/url_matcher/url_matcher_factory.cc
@@ -248,9 +248,7 @@ std::unique_ptr<URLMatcherPortFilter> URLMatcherFactory::CreateURLMatcherPorts(
     return nullptr;
   }
 
-  for (base::ListValue::const_iterator i = value_list->begin();
-       i != value_list->end(); ++i) {
-    base::Value* entry = *i;
+  for (const auto& entry : *value_list) {
     int port = 0;
     base::ListValue* range = NULL;
     if (entry->GetAsInteger(&port)) {