Revert of Show message center on lock screen

ui/message_center/notification_list.cc

Index: ui/message_center/notification_list.cc
diff --git a/ui/message_center/notification_list.cc b/ui/message_center/notification_list.cc
index 0ac3b1cbb8b07d68ae42e5a5565bc5e8b11af0b1..14abd9b5c420b4a5994288acd9524248ec2a3ff5 100644
--- a/ui/message_center/notification_list.cc
+++ b/ui/message_center/notification_list.cc
@@ -12,7 +12,6 @@
 #include "base/time/time.h"
 #include "base/values.h"
 #include "ui/gfx/image/image.h"
-#include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_blocker.h"
@@ -55,8 +54,8 @@
   return false;
 }
 
-NotificationList::NotificationList(MessageCenter* message_center)
-    : message_center_(message_center),
+NotificationList::NotificationList()
+    : message_center_visible_(false),
       quiet_mode_(false) {
 }
 
@@ -64,12 +63,19 @@
   STLDeleteContainerPointers(notifications_.begin(), notifications_.end());
 }
 
-void NotificationList::SetNotificationsShown(
-    const NotificationBlockers& blockers,
+void NotificationList::SetMessageCenterVisible(
+    bool visible,
     std::set<std::string>* updated_ids) {
-  Notifications notifications = GetVisibleNotifications(blockers);
-
-  for (auto iter = notifications.begin(); iter != notifications.end(); ++iter) {
+  if (message_center_visible_ == visible)
+    return;
+
+  message_center_visible_ = visible;
+
+  if (!visible)
+    return;
+
+  for (Notifications::iterator iter = notifications_.begin();
+       iter != notifications_.end(); ++iter) {
     Notification* notification = *iter;
     bool was_popup = notification->shown_as_popup();
     bool was_read = notification->IsRead();
@@ -340,7 +346,7 @@
     // TODO(mukai): needs to distinguish if a notification is dismissed by
     // the quiet mode or user operation.
     notification->set_is_read(false);
-    notification->set_shown_as_popup(message_center_->IsMessageCenterVisible()
+    notification->set_shown_as_popup(message_center_visible_
                                      || quiet_mode_
                                      || notification->shown_as_popup());
   }