Reduce the maximum number of list items in notifications.

ui/message_center/message_center_style.cc

Index: ui/message_center/message_center_style.cc
diff --git a/ui/message_center/message_center_style.cc b/ui/message_center/message_center_style.cc
index 10346f8bdd08aaf906446f084f27cb0d6cf1b918..521595751a26eee05a71f0270e27f7d91150e249 100644
--- a/ui/message_center/message_center_style.cc
+++ b/ui/message_center/message_center_style.cc
@@ -59,7 +59,7 @@ gfx::Size GetImageSizeForWidth(int width, const gfx::Size& image_size) {
   return size;
 }
 
-const size_t kNotificationMaximumItems = 8;
+const size_t kNotificationMaximumItems = 5;
 
 // Timing.
 const int kAutocloseDefaultDelaySeconds = 8;