Change base::Value::ListStorage to std::vector<base::Value>

components/prefs/pref_member.cc

Index: components/prefs/pref_member.cc
diff --git a/components/prefs/pref_member.cc b/components/prefs/pref_member.cc
index 8ed13ee5516769d8d6bae89089c9ab9115a4667f..f0be267ed5d360d4137bc356127a2f2f26cd7065 100644
--- a/components/prefs/pref_member.cc
+++ b/components/prefs/pref_member.cc
@@ -139,7 +139,7 @@ bool PrefMemberVectorStringUpdate(const base::Value& value,
   for (base::ListValue::const_iterator it = list->begin();
        it != list->end(); ++it) {
     std::string string_value;
-    if (!(*it)->GetAsString(&string_value))
+    if (!it->GetAsString(&string_value))
       return false;
 
     local_vector.push_back(string_value);