MacViews: Fix failing bubble border tests after r375729.

ui/views/bubble/bubble_border_unittest.cc

Index: ui/views/bubble/bubble_border_unittest.cc
diff --git a/ui/views/bubble/bubble_border_unittest.cc b/ui/views/bubble/bubble_border_unittest.cc
index e472e1b4fbf40241d7e2da9c86618a84b530a91e..19f6968fba5b2dc47bf3f9e79af0ccbde618b3a9 100644
--- a/ui/views/bubble/bubble_border_unittest.cc
+++ b/ui/views/bubble/bubble_border_unittest.cc
@@ -224,7 +224,7 @@ TEST_F(BubbleBorderTest, GetSizeForContentsSizeTest) {
   const gfx::Size kMediumSize = gfx::Size(50, 60);
 
   const gfx::Size kSmallHorizArrow(
-      2 * kImages->border_thickness + kImages->top_arrow.width(),
+      2 * kImages->border_thickness + kImages->arrow_width,
       kImages->border_thickness + kImages->arrow_thickness +
           kImages->border_interior_thickness);
 
@@ -345,7 +345,7 @@ TEST_F(BubbleBorderTest, GetBoundsOriginTest) {
   const int kArrowOffsetForHorizCenter = kTotalSizeWithHorizArrow.width() / 2;
   const int kArrowOffsetForVertCenter = kTotalSizeWithVertArrow.height() / 2;
   const int kArrowOffsetForNotCenter =
-      kImages->border_thickness + (kImages->top_arrow.width() / 2);
+      kImages->border_thickness + (kImages->arrow_width / 2);
 
   const int kArrowSize =
       kImages->arrow_interior_thickness + BubbleBorder::kStroke -