Rework a bit the NetworkList implementation.

chrome/browser/chromeos/login/network_screen.cc

Index: chrome/browser/chromeos/login/network_screen.cc
diff --git a/chrome/browser/chromeos/login/network_screen.cc b/chrome/browser/chromeos/login/network_screen.cc
index c0c86bb1086de624eac46f58efb4ddbc49b35583..50895fd103ea28cdd80bc26d7c45081005c569e6 100644
--- a/chrome/browser/chromeos/login/network_screen.cc
+++ b/chrome/browser/chromeos/login/network_screen.cc
@@ -37,12 +37,12 @@ NetworkScreen::~NetworkScreen() {
 int NetworkScreen::GetItemCount() {
   // Item with index = 0 is either "no networks are available" or
   // "no selection".
-  return static_cast<int>(networks_.GetNetworkCount()) + 1;
+  return networks_.size() + 1;
 }
 
 std::wstring NetworkScreen::GetItemAt(int index) {
   if (index == 0) {
-    return networks_.IsEmpty() ?
+    return networks_.empty() ?
         l10n_util::GetString(IDS_STATUSBAR_NO_NETWORKS_MESSAGE) :
         l10n_util::GetString(IDS_NETWORK_SELECTION_NONE);
   }
@@ -66,7 +66,7 @@ void NetworkScreen::ItemChanged(views::Combobox* sender,
     return;
   }
 
-  if (networks_.IsEmpty())
+  if (networks_.empty())
     return;
 
   const NetworkList::NetworkItem* network =