Pure pedantry: Replace all ".size() == 0" with ".empty()".

chrome/browser/chromeos/network_message_observer.cc

Index: chrome/browser/chromeos/network_message_observer.cc
diff --git a/chrome/browser/chromeos/network_message_observer.cc b/chrome/browser/chromeos/network_message_observer.cc
index 951bffad85ff2230853204f5bc740aff52ea0be0..986a6805f987e9b1f7c337583e7dd542713de8b1 100644
--- a/chrome/browser/chromeos/network_message_observer.cc
+++ b/chrome/browser/chromeos/network_message_observer.cc
@@ -230,7 +230,7 @@ void NetworkMessageObserver::OnCellularDataPlanChanged(NetworkLibrary* cros) {
       cros->GetDataPlans(cellular->service_path());
 
   // If no plans available, check to see if we need a new plan.
-  if (!plans || plans->size() == 0) {
+  if (!plans || plans->empty()) {
     // If previously, we had a low data notification, we know that a plan was
     // near expiring. In that case, because the plan has disappeared, we assume
     // that it expired.