Remove top and bottom margins from TrayBubbleView

ui/message_center/message_popup_bubble.cc

 // 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.
 
 #include "ui/message_center/message_popup_bubble.h"
 
 #include "ui/message_center/message_view.h"
 #include "ui/message_center/message_view_factory.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 #include "ui/views/layout/box_layout.h"
@@ skipping 57 matching lines @@
       num_popups_(0) {
 }
 
 MessagePopupBubble::~MessagePopupBubble() {
 }
 
 views::TrayBubbleView::InitParams MessagePopupBubble::GetInitParams(
     views::TrayBubbleView::AnchorAlignment anchor_alignment) {
   views::TrayBubbleView::InitParams init_params =
       GetDefaultInitParams(anchor_alignment);
-  init_params.top_color = kBackgroundColor;
   init_params.arrow_color = kBackgroundColor;
   init_params.close_on_deactivate = false;
   return init_params;
 }
 
 void MessagePopupBubble::InitializeContents(
     views::TrayBubbleView* bubble_view) {
   bubble_view_ = bubble_view;
   contents_view_ = new PopupBubbleContentsView(list_delegate_);
   bubble_view_->AddChildView(contents_view_);
@@ skipping 46 matching lines @@
   list_delegate_->GetNotificationList()->MarkPopupsAsShown();
   num_popups_ = 0;
   UpdateBubbleView();
 }
 
 size_t MessagePopupBubble::NumMessageViewsForTest() const {
   return contents_view_->NumMessageViews();
 }
 
 }  // namespace message_center