Adjust positioning of cros tray bubbles.

ui/message_center/views/message_center_bubble.h

Index: ui/message_center/views/message_center_bubble.h
diff --git a/ui/message_center/views/message_center_bubble.h b/ui/message_center/views/message_center_bubble.h
index b7053aec4d0b1a79a3a32a4ecb55728590a47239..4364a124d76146a5aa6b612da482cb74fdc3590e 100644
--- a/ui/message_center/views/message_center_bubble.h
+++ b/ui/message_center/views/message_center_bubble.h
@@ -23,9 +23,7 @@ class MESSAGE_CENTER_EXPORT MessageCenterBubble
       public views::WidgetObserver,
       public base::SupportsWeakPtr<MessageCenterBubble> {
  public:
-  MessageCenterBubble(MessageCenter* message_center,
-                      MessageCenterTray* tray,
-                      bool first_item_has_no_margin);
+  MessageCenterBubble(MessageCenter* message_center, MessageCenterTray* tray);
 
   ~MessageCenterBubble() override;
 
@@ -51,10 +49,6 @@ class MESSAGE_CENTER_EXPORT MessageCenterBubble
   // Use settings view as the initially visible content if true.
   bool initially_settings_visible_;
 
-  // True if the first message which gets shown should have no margin against
-  // the used anchor.
-  bool first_item_has_no_margin_;
-
   DISALLOW_COPY_AND_ASSIGN(MessageCenterBubble);
 };