tray: Show warning in network tray when VPN or proxy used.

chrome/browser/ui/ash/networking_config_delegate_chromeos.h

Index: chrome/browser/ui/ash/networking_config_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/networking_config_delegate_chromeos.h b/chrome/browser/ui/ash/networking_config_delegate_chromeos.h
index 09e959c1276f7cd8caf759f9337d54c96ba34959..5b7961dc28d949cfeb6704d380a70d90fae9b349 100644
--- a/chrome/browser/ui/ash/networking_config_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/networking_config_delegate_chromeos.h
@@ -24,6 +24,8 @@ class NetworkingConfigDelegateChromeos : public ash::NetworkingConfigDelegate {
   std::unique_ptr<const ExtensionInfo> LookUpExtensionForNetwork(
       const std::string& guid) override;
 
+  bool HasDefaultNetworkProxyConfigured() override;

[sammiequon, 2017/04/20 23:28:52]

Steven, do you know where this should go? I was thinking of making a new
delegate but wonder if you knew of a good existing place.

+
  private:
   std::string LookUpExtensionName(content::BrowserContext* context,
                                   std::string extension_id) const;