Reduce views::Border creation verbosity by promoting factory functions

ash/common/shelf/shelf_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/shelf/shelf_view.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "ash/common/ash_constants.h"
@@ skipping 1042 matching lines @@
 
 void ShelfView::AnimateToIdealBounds() {
   IdealBounds ideal_bounds;
   CalculateIdealBounds(&ideal_bounds);
   for (int i = 0; i < view_model_->view_size(); ++i) {
     View* view = view_model_->view_at(i);
     bounds_animator_->AnimateViewTo(view, view_model_->ideal_bounds(i));
     // Now that the item animation starts, we have to make sure that the
     // padding of the first gets properly transferred to the new first item.
     if (i && view->border())
-      view->SetBorder(views::Border::NullBorder());
+      view->SetBorder(views::NullBorder());
   }
   overflow_button_->SetBoundsRect(ideal_bounds.overflow_bounds);
 }
 
 views::View* ShelfView::CreateViewForItem(const ShelfItem& item) {
   views::View* view = nullptr;
   switch (item.type) {
     case TYPE_BROWSER_SHORTCUT:
     case TYPE_APP_SHORTCUT:
     case TYPE_WINDOWED_APP:
@@ skipping 840 matching lines @@
 
 int ShelfView::CalculateShelfDistance(const gfx::Point& coordinate) const {
   const gfx::Rect bounds = GetBoundsInScreen();
   int distance = wm_shelf_->SelectValueForShelfAlignment(
       bounds.y() - coordinate.y(), coordinate.x() - bounds.right(),
       bounds.x() - coordinate.x());
   return distance > 0 ? distance : 0;
 }
 
 }  // namespace ash