Remove update icon after user confirms download

ash/system/tray/system_tray_notifier.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/tray/system_tray_notifier.h"
 
 #include "ash/system/accessibility_observer.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
 #include "ash/system/date/clock_observer.h"
 #include "ash/system/enterprise/enterprise_domain_observer.h"
 #include "ash/system/ime/ime_observer.h"
 #include "ash/system/network/network_observer.h"
 #include "ash/system/network/network_portal_detector_observer.h"
 #include "ash/system/screen_security/screen_capture_observer.h"
 #include "ash/system/screen_security/screen_share_observer.h"
 #include "ash/system/session/last_window_closed_observer.h"
 #include "ash/system/session/logout_button_observer.h"
 #include "ash/system/status_area_focus_observer.h"
 #include "ash/system/tray_tracing.h"
+#include "ash/system/update/update_observer.h"
 #include "ash/system/virtual_keyboard/virtual_keyboard_observer.h"
 
 namespace ash {
 
 SystemTrayNotifier::SystemTrayNotifier() {}
 
 SystemTrayNotifier::~SystemTrayNotifier() {}
 
 void SystemTrayNotifier::AddAccessibilityObserver(
     AccessibilityObserver* observer) {
@@ skipping 219 matching lines @@
 
 void SystemTrayNotifier::RemoveTracingObserver(TracingObserver* observer) {
   tracing_observers_.RemoveObserver(observer);
 }
 
 void SystemTrayNotifier::NotifyTracingModeChanged(bool value) {
   for (auto& observer : tracing_observers_)
     observer.OnTracingModeChanged(value);
 }
 
+void SystemTrayNotifier::AddUpdateObserver(UpdateObserver* observer) {
+  update_observers_.AddObserver(observer);
+}
+
+void SystemTrayNotifier::RemoveUpdateObserver(UpdateObserver* observer) {
+  update_observers_.RemoveObserver(observer);
+}
+
+void SystemTrayNotifier::NotifyUpdateOverCellularTargetSet(bool success) {
+  for (auto& observer : update_observers_)
+    observer.OnUpdateOverCellularTargetSet(success);
+}
+
 void SystemTrayNotifier::AddVirtualKeyboardObserver(
     VirtualKeyboardObserver* observer) {
   virtual_keyboard_observers_.AddObserver(observer);
 }
 
 void SystemTrayNotifier::RemoveVirtualKeyboardObserver(
     VirtualKeyboardObserver* observer) {
   virtual_keyboard_observers_.RemoveObserver(observer);
 }
 
 void SystemTrayNotifier::NotifyVirtualKeyboardSuppressionChanged(
     bool suppressed) {
   for (auto& observer : virtual_keyboard_observers_)
     observer.OnKeyboardSuppressionChanged(suppressed);
 }
 
 }  // namespace ash