Added ellipses when the title of notifications is too long.

ui/message_center/notification_view.cc

Index: ui/message_center/notification_view.cc
diff --git a/ui/message_center/notification_view.cc b/ui/message_center/notification_view.cc
index 7e61402ce9860494ae86704ad3bd186b3fb94871..22d1fc47f6b6feafe182eeedb026568213d086a4 100644
--- a/ui/message_center/notification_view.cc
+++ b/ui/message_center/notification_view.cc
@@ -146,6 +146,7 @@ void NotificationView::SetUpView() {
   // TODO(dharcourt): Skip the title Label when there's no title text.
   views::Label* title = new views::Label(notification_.title);
   title->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  title->SetElideBehavior(views::Label::ELIDE_AT_END);
   title->SetFont(title->font().DeriveFont(4));
   title->SetEnabledColor(kTitleColor);
   title->SetBackgroundColor(kTitleBackgroundColor);