athena: Avoid initializaing chromeos::Network for tests.

athena/system/status_icon_container_view.cc

Index: athena/system/status_icon_container_view.cc
diff --git a/athena/system/status_icon_container_view.cc b/athena/system/status_icon_container_view.cc
index 811c645cfa8d3a6e11953c1ba0f48d2bd54ea977..c93469f225be77a0c8eb08ae13f615a497d3db99 100644
--- a/athena/system/status_icon_container_view.cc
+++ b/athena/system/status_icon_container_view.cc
@@ -226,7 +226,8 @@ StatusIconContainerView::StatusIconContainerView(
   AddChildView(CreateLabel(color_scheme, "Network:"));
   views::Label* network_label = CreateLabel(color_scheme, std::string());
   AddChildView(network_label);
-  network_status_.reset(new NetworkStatus(network_label));
+  if (chromeos::NetworkHandler::IsInitialized())
+    network_status_.reset(new NetworkStatus(network_label));
 
   views::ImageView* battery_view = new views::ImageView();
   AddChildView(battery_view);