Reduce views::Border creation verbosity by promoting factory functions

ash/common/system/tray/tray_background_view.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/common/system/tray/tray_background_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
@@ skipping 218 matching lines @@
   const gfx::Insets insets(
       ash::MaterialDesignController::IsShelfMaterial()
           ? is_horizontal ? gfx::Insets(0, kHitRegionPadding, 0,
                                         kHitRegionPadding + kSeparatorWidth)
                           : gfx::Insets(kHitRegionPadding, 0,
                                         kHitRegionPadding + kSeparatorWidth, 0)
           : gfx::Insets(kBackgroundAdjustPadding));
   const gfx::Insets margin(
       is_horizontal ? gfx::Insets(cross_axis_margin_, main_axis_margin_)
                     : gfx::Insets(main_axis_margin_, cross_axis_margin_));
-  SetBorder(views::Border::CreateEmptyBorder(insets + margin));
+  SetBorder(views::CreateEmptyBorder(insets + margin));
 
   views::BoxLayout* layout = new views::BoxLayout(orientation, 0, 0, 0);
   if (!ash::MaterialDesignController::IsShelfMaterial())
     layout->SetDefaultFlex(1);
   layout->set_minimum_cross_axis_size(kTrayItemSize);
   views::View::SetLayoutManager(layout);
 
   PreferredSizeChanged();
 }
 
@@ skipping 316 matching lines @@
   paint.setAntiAlias(true);
 
   const gfx::Rect bounds = horizontal_shelf ? gfx::Rect(x, y, width, height)
                                             : gfx::Rect(y, x, height, width);
   gfx::RectF rect(gfx::ScaleRect(gfx::RectF(bounds), scale));
   canvas->DrawLine(horizontal_shelf ? rect.top_right() : rect.bottom_left(),
                    rect.bottom_right(), paint);
 }
 
 }  // namespace ash