MD cros - Fix padding in system tray

ash/common/system/tray/tray_background_view.h

Index: ash/common/system/tray/tray_background_view.h
diff --git a/ash/common/system/tray/tray_background_view.h b/ash/common/system/tray/tray_background_view.h
index 4932427c45d3dcb982aaad57535f7843cdbeea44..cb22ed649c3838b98a402bd197f156133da76f4f 100644
--- a/ash/common/system/tray/tray_background_view.h
+++ b/ash/common/system/tray/tray_background_view.h
@@ -41,13 +41,8 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
 
     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;
@@ -59,7 +54,6 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
     void UpdateLayout();
 
     ShelfAlignment alignment_;
-    gfx::Size size_;
     int main_axis_margin_ = 0;
     int cross_axis_margin_ = 0;