ash: Fix a crash when going back to the main uber-tray popup from the network popup.

ash/system/network/tray_network.cc

Index: ash/system/network/tray_network.cc
diff --git a/ash/system/network/tray_network.cc b/ash/system/network/tray_network.cc
index a8f9a0a2856488affb9bf736a2aeea6f78b3d98a..6c88fe67eff4766796045faacf83e5dc7e2e29e4 100644
--- a/ash/system/network/tray_network.cc
+++ b/ash/system/network/tray_network.cc
@@ -468,8 +468,10 @@ class NetworkDetailedView : public TrayDetailsView,
     // on.
     ResetInfoBubble();
 
-    if (sender == footer()->content())
+    if (sender == footer()->content()) {
       Shell::GetInstance()->tray()->ShowDefaultView(BUBBLE_USE_EXISTING);
+      return;
+    }
 
     if (login_ == user::LOGGED_IN_LOCKED)
       return;