Rewrite simple uses of base::ListValue::Append(base::Value*) on CrOS.

chrome/browser/chromeos/settings/owner_flags_storage.cc

Index: chrome/browser/chromeos/settings/owner_flags_storage.cc
diff --git a/chrome/browser/chromeos/settings/owner_flags_storage.cc b/chrome/browser/chromeos/settings/owner_flags_storage.cc
index 8b52ea83d5d37852ce633cf329dbbc96d7f4bfd3..d72e484d98d1fbb5966954079bb73520044dc367 100644
--- a/chrome/browser/chromeos/settings/owner_flags_storage.cc
+++ b/chrome/browser/chromeos/settings/owner_flags_storage.cc
@@ -37,7 +37,7 @@ bool OwnerFlagsStorage::SetFlags(const std::set<std::string>& flags) {
   for (base::CommandLine::StringVector::const_iterator it =
            switches.begin() + 1;
        it != switches.end(); ++it) {
-    experiments_list.Append(new base::StringValue(*it));
+    experiments_list.AppendString(*it);
   }
   owner_settings_service_->Set(kStartUpFlags, experiments_list);