TrayNotificationView: Initialize uninitialized member in constructor.

BUG=None 
CID=115769

Review URL: https://codereview.chromium.org/309113003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274564 0039d316-1c4b-4281-b951-d872f2087c98

ash/system/tray/tray_notification_view.cc

@@ -20,7 +20,8 @@ namespace ash {
 TrayNotificationView::TrayNotificationView(SystemTrayItem* owner, int icon_id)
     : owner_(owner),
       icon_id_(icon_id),
-      icon_(NULL) {
+      icon_(NULL),
+      autoclose_delay_(0) {
 }
 
 TrayNotificationView::~TrayNotificationView() {