Adjust positioning of cros tray bubbles.

ui/message_center/views/message_center_bubble.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_BUBBLE_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_BUBBLE_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/message_center/message_center_export.h"
 #include "ui/message_center/views/message_bubble_base.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace message_center {
 
 class MessageCenterView;
 
 // Bubble for message center.
 class MESSAGE_CENTER_EXPORT MessageCenterBubble
     : public MessageBubbleBase,
       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;
 
   void SetSettingsVisible();
 
   // Overridden from views::WidgetObserver:
   void OnWidgetClosing(views::Widget* widget) override;
 
   // Overridden from MessageBubbleBase:
   views::TrayBubbleView::InitParams GetInitParams(
       views::TrayBubbleView::AnchorAlignment anchor_alignment) override;
   void InitializeContents(views::TrayBubbleView* bubble_view) override;
   void OnBubbleViewDestroyed() override;
   void UpdateBubbleView() override;
   void OnMouseEnteredView() override;
   void OnMouseExitedView() override;
 
   size_t NumMessageViewsForTest() const;
 
  private:
   MessageCenterView* message_center_view_;
 
   // 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);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_BUBBLE_H_