Reduce views::Border creation verbosity by promoting factory functions

ui/views/controls/button/image_button_unittest.cc

Index: ui/views/controls/button/image_button_unittest.cc
diff --git a/ui/views/controls/button/image_button_unittest.cc b/ui/views/controls/button/image_button_unittest.cc
index 9ea71644a3f36a91fade82873f05395adab1463a..f9c20167cdfbfd86b203c7cff84afe2503946164 100644
--- a/ui/views/controls/button/image_button_unittest.cc
+++ b/ui/views/controls/button/image_button_unittest.cc
@@ -105,11 +105,11 @@ TEST_F(ImageButtonTest, ImagePositionWithBorder) {
   EXPECT_EQ(gfx::Point().ToString(),
             button.ComputeImagePaintPosition(image).ToString());
 
-  button.SetBorder(views::Border::CreateEmptyBorder(10, 5, 0, 0));
+  button.SetBorder(views::CreateEmptyBorder(10, 5, 0, 0));
   EXPECT_EQ(gfx::Point(5, 10).ToString(),
             button.ComputeImagePaintPosition(image).ToString());
 
-  button.SetBorder(Border::NullBorder());
+  button.SetBorder(NullBorder());
   button.SetBounds(0, 0, 50, 50);
   EXPECT_EQ(gfx::Point().ToString(),
             button.ComputeImagePaintPosition(image).ToString());
@@ -118,7 +118,7 @@ TEST_F(ImageButtonTest, ImagePositionWithBorder) {
                            ImageButton::ALIGN_MIDDLE);
   EXPECT_EQ(gfx::Point(15, 10).ToString(),
             button.ComputeImagePaintPosition(image).ToString());
-  button.SetBorder(views::Border::CreateEmptyBorder(10, 10, 0, 0));
+  button.SetBorder(views::CreateEmptyBorder(10, 10, 0, 0));
   EXPECT_EQ(gfx::Point(20, 15).ToString(),
             button.ComputeImagePaintPosition(image).ToString());