Updates to Ash material design icons used for TrayImageItem

ash/test/test_system_tray_delegate.cc

Index: ash/test/test_system_tray_delegate.cc
diff --git a/ash/test/test_system_tray_delegate.cc b/ash/test/test_system_tray_delegate.cc
index deafe17f4397c211d6bcf46ac0542436a202f330..f620a4b572c8598fbe659e79f4a32b8fa7253015 100644
--- a/ash/test/test_system_tray_delegate.cc
+++ b/ash/test/test_system_tray_delegate.cc
@@ -91,7 +91,7 @@ bool TestSystemTrayDelegate::IsUserSupervised() const {
 
 void TestSystemTrayDelegate::GetSystemUpdateInfo(UpdateInfo* info) const {
   DCHECK(info);
-  info->severity = UpdateInfo::UPDATE_NORMAL;
+  info->severity = UpdateInfo::UPDATE_NONE;
   info->update_required = g_system_update_required;
   info->factory_reset_required = false;
 }