Do not activate system tray bubble by default

ash/common/system/date/date_default_view.cc

Index: ash/common/system/date/date_default_view.cc
diff --git a/ash/common/system/date/date_default_view.cc b/ash/common/system/date/date_default_view.cc
index e7f0f883813620f5959472d6fd14a66c6c81811c..6c03a9697c408dfdea1f6f57b14db67fc88dd2d7 100644
--- a/ash/common/system/date/date_default_view.cc
+++ b/ash/common/system/date/date_default_view.cc
@@ -9,6 +9,7 @@
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/date/date_view.h"
 #include "ash/common/system/tray/special_popup_row.h"
+#include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_header_button.h"
@@ -41,15 +42,15 @@ const int kPaddingVertical = 19;
 
 namespace ash {
 
-DateDefaultView::DateDefaultView(LoginStatus login)
-    : help_button_(NULL),
-      shutdown_button_(NULL),
-      lock_button_(NULL),
-      date_view_(NULL),
+DateDefaultView::DateDefaultView(SystemTrayItem* owner, LoginStatus login)
+    : help_button_(nullptr),
+      shutdown_button_(nullptr),
+      lock_button_(nullptr),
+      date_view_(nullptr),
       weak_factory_(this) {
   SetLayoutManager(new views::FillLayout);
 
-  date_view_ = new tray::DateView();
+  date_view_ = new tray::DateView(owner);
   date_view_->SetBorder(views::Border::CreateEmptyBorder(
       kPaddingVertical, ash::kTrayPopupPaddingHorizontal, 0, 0));
   SpecialPopupRow* view = new SpecialPopupRow();
@@ -166,6 +167,7 @@ void DateDefaultView::ButtonPressed(views::Button* sender,
   } else {
     NOTREACHED();
   }
+  date_view_->CloseSystemBubble();
 }
 
 void DateDefaultView::OnShutdownPolicyChanged(bool reboot_on_shutdown) {