Remove update icon after user confirms download

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
index a7d6a9ba034cb011dcc0b9a2b74eb1137c96d801..9972c9326fd5d9bb33354ff7eedafbb6d120de4f 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -19,6 +19,7 @@
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_list_observer.h"
+#include "chromeos/dbus/update_engine_client.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ -40,7 +41,8 @@ class SystemTrayDelegateChromeOS
       public input_method::InputMethodManager::Observer,
       public chrome::BrowserListObserver,
       public extensions::AppWindowRegistry::Observer,
-      public input_method::InputMethodManager::ImeMenuObserver {
+      public input_method::InputMethodManager::ImeMenuObserver,
+      public UpdateEngineClient::Observer {
  public:
   SystemTrayDelegateChromeOS();
   ~SystemTrayDelegateChromeOS() override;
@@ -115,6 +117,9 @@ class SystemTrayDelegateChromeOS
       const std::vector<input_method::InputMethodManager::MenuItem>& items)
       override;
 
+  // Overridden from UpdateEngineClient::Observer.
+  void OnUpdateOverCellularTargetSet(bool success) override;
+
   std::unique_ptr<content::NotificationRegistrar> registrar_;
   std::unique_ptr<PrefChangeRegistrar> user_pref_registrar_;
   Profile* user_profile_ = nullptr;
@@ -123,6 +128,9 @@ class SystemTrayDelegateChromeOS
   std::unique_ptr<ash::NetworkingConfigDelegate> networking_config_delegate_;
   std::unique_ptr<AccessibilityStatusSubscription> accessibility_subscription_;
 
+  // By default, set to false. If Initialize() function is called, set to true.
+  bool initialized_;
+
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOS);
 };