Remove top and bottom margins from TrayBubbleView

ash/system/tray/system_tray.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 "ash/system/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
 #include "ash/shell_window_ids.h"
@@ skipping 394 matching lines @@
     system_bubble_->bubble()->UpdateView(items, bubble_type);
   } else {
     TrayBubbleView::InitParams init_params(TrayBubbleView::ANCHOR_TYPE_TRAY,
                                            GetAnchorAlignment(),
                                            kTrayPopupWidth);
     init_params.can_activate = can_activate;
     if (detailed) {
       // This is the case where a volume control or brightness control bubble
       // is created.
       init_params.max_height = default_bubble_height_;
-      init_params.top_color = kBackgroundColor;
       init_params.arrow_color = kBackgroundColor;
     } else {
-      init_params.top_color = kBackgroundColor;
       init_params.arrow_color = kHeaderBackgroundColorDark;
     }
     init_params.arrow_offset = arrow_offset;
     SystemTrayBubble* bubble = new SystemTrayBubble(this, items, bubble_type);
     system_bubble_.reset(new internal::SystemBubbleWrapper(bubble));
     system_bubble_->InitView(this, tray_container(), &init_params);
   }
   // Save height of default view for creating detailed views directly.
   if (!detailed)
     default_bubble_height_ = system_bubble_->bubble_view()->height();
@@ skipping 44 matching lines @@
   if (system_bubble_.get()) {
     anchor = system_bubble_->bubble_view();
     anchor_type = TrayBubbleView::ANCHOR_TYPE_BUBBLE;
   } else {
     anchor = tray_container();
     anchor_type = TrayBubbleView::ANCHOR_TYPE_TRAY;
   }
   TrayBubbleView::InitParams init_params(anchor_type,
                                          GetAnchorAlignment(),
                                          kTrayPopupWidth);
-  init_params.top_color = kBackgroundColor;
   init_params.arrow_color = kBackgroundColor;
   init_params.arrow_offset = GetTrayXOffset(notification_items_[0]);
   notification_bubble_.reset(
       new internal::SystemBubbleWrapper(notification_bubble));
   notification_bubble_->InitView(this, anchor, &init_params);
 
   if (notification_bubble->bubble_view()->child_count() == 0) {
     // It is possible that none of the items generated actual notifications.
     DestroyNotificationBubble();
     return;
@@ skipping 105 matching lines @@
         ConvertPointToWidget(this, &point);
         arrow_offset = point.x();
       }
     }
     ShowDefaultViewWithOffset(BUBBLE_CREATE_NEW, arrow_offset);
   }
   return true;
 }
 
 }  // namespace ash