Convert TrayVPN to use new NetworkState code

ash/system/chromeos/network/tray_network_state_observer.h

Index: ash/system/chromeos/network/tray_network_state_observer.h
diff --git a/ash/system/chromeos/network/tray_network_state_observer.h b/ash/system/chromeos/network/tray_network_state_observer.h
index 94ea75f6dc1d7d40782bf73172acf2f8a7b50284..4a61dfd8079482e84e73624f531343ee8a554c45 100644
--- a/ash/system/chromeos/network/tray_network_state_observer.h
+++ b/ash/system/chromeos/network/tray_network_state_observer.h
@@ -13,17 +13,23 @@
 namespace ash {
 namespace internal {
 
-class TrayNetwork;
-
 class TrayNetworkStateObserver : public chromeos::NetworkStateHandlerObserver {
  public:
-  enum WifiState {
-    WIFI_DISABLED,
-    WIFI_ENABLED,
-    WIFI_UNKNOWN,
+  class Delegate {
+   public:
+    // Called when the network state may have changed. If |list_changed| is
+    // true then the list of networks may have changed.
+    virtual void NetworkStateChanged(bool list_changed) = 0;
+
+    // Called when the properties for |network| may have been updated.
+    virtual void NetworkServiceChanged(
+        const chromeos::NetworkState* network) = 0;
+
+   protected:
+    virtual ~Delegate() {}
   };
 
-  explicit TrayNetworkStateObserver(TrayNetwork* tray);
+  explicit TrayNetworkStateObserver(Delegate* delegate);
 
   virtual ~TrayNetworkStateObserver();
 
@@ -36,9 +42,14 @@ class TrayNetworkStateObserver : public chromeos::NetworkStateHandlerObserver {
   virtual void NetworkPropertiesUpdated(
       const chromeos::NetworkState* network) OVERRIDE;
 
+  // Keep track of user initiated connecting networks
+  static void AddConnectingNetwork(const std::string& service_path);
+
+  // Returns true if a user initiated connection to |network| occured
+  static bool HasConnectingNetwork(const std::string& service_path);
+
  private:
-  TrayNetwork* tray_;
-  WifiState wifi_state_;  // cache wifi enabled state
+  Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayNetworkStateObserver);
 };