MD cros - Fix padding in system tray

ash/common/system/tray/tray_background_view.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 ASH_COMMON_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 23 matching lines @@
 
   // Base class for tray containers. Sets the border and layout. The container
   // auto-resizes the widget when necessary.
   class TrayContainer : public views::View {
    public:
     explicit TrayContainer(ShelfAlignment alignment);
     ~TrayContainer() override {}
 
     void SetAlignment(ShelfAlignment alignment);
 
-    void set_size(const gfx::Size& size) { size_ = size; }
-
     void SetMargin(int main_axis_margin, int cross_axis_margin);
 
-    // views::View:
-    gfx::Size GetPreferredSize() const override;
-
    protected:
     // views::View:
     void ChildPreferredSizeChanged(views::View* child) override;
     void ChildVisibilityChanged(View* child) override;
     void ViewHierarchyChanged(
         const ViewHierarchyChangedDetails& details) override;
 
    private:
     void UpdateLayout();
 
     ShelfAlignment alignment_;
-    gfx::Size size_;
     int main_axis_margin_ = 0;
     int cross_axis_margin_ = 0;
 
     DISALLOW_COPY_AND_ASSIGN(TrayContainer);
   };
 
   explicit TrayBackgroundView(WmShelf* wm_shelf);
   ~TrayBackgroundView() override;
 
   // Called after the tray has been added to the widget containing it.
@@ skipping 104 matching lines @@
 
   std::unique_ptr<TrayWidgetObserver> widget_observer_;
   std::unique_ptr<TrayEventFilter> tray_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBackgroundView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_