Hide notifications popups when entering fullscreen mode.

chrome/browser/notifications/message_center_notification_manager.h

Index: chrome/browser/notifications/message_center_notification_manager.h
diff --git a/chrome/browser/notifications/message_center_notification_manager.h b/chrome/browser/notifications/message_center_notification_manager.h
index 89493a25f657e54a826ee1f6ee2f31bf2f8eec90..91701d205b03df7538285bb7cf8caf9622b8dda6 100644
--- a/chrome/browser/notifications/message_center_notification_manager.h
+++ b/chrome/browser/notifications/message_center_notification_manager.h
@@ -16,6 +16,8 @@
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
 #include "chrome/browser/notifications/notification_ui_manager_impl.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_observer.h"
 #include "ui/message_center/message_center_tray_delegate.h"
@@ -81,6 +83,12 @@ class MessageCenterNotificationManager
   void SetMessageCenterTrayDelegateForTest(
       message_center::MessageCenterTrayDelegate* delegate);
 
+ protected:
+  // content::NotificationObserver override.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
  private:
   class ImageDownloadsObserver {
    public:
@@ -214,6 +222,9 @@ class MessageCenterNotificationManager
 
   scoped_ptr<MessageCenterSettingsController> settings_controller_;
 
+  // Registrar for the other kind of notifications (event signaling).
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(MessageCenterNotificationManager);
 };