use SkClipOps where we can, legacyClip where we need to rework

ui/views/bubble/bubble_border.cc

Index: ui/views/bubble/bubble_border.cc
diff --git a/ui/views/bubble/bubble_border.cc b/ui/views/bubble/bubble_border.cc
index f6d2d6a46f42a50e4968ab98d32fcbe15b36dea5..d4302d7bc63e38dc7953f5bfd79d9218e7f1c9a0 100644
--- a/ui/views/bubble/bubble_border.cc
+++ b/ui/views/bubble/bubble_border.cc
@@ -211,7 +211,7 @@ void BubbleBorder::Paint(const views::View& view, gfx::Canvas* canvas) {
   // Clip the arrow bounds out to avoid painting the overlapping edge area.
   canvas->Save();
   SkRect arrow_rect(gfx::RectToSkRect(arrow_bounds));
-  canvas->sk_canvas()->clipRect(arrow_rect, SkRegion::kDifference_Op);
+  canvas->sk_canvas()->clipRect(arrow_rect, kDifference_SkClipOp);
   Painter::PaintPainterAt(canvas, images_->border_painter.get(), bounds);
   canvas->Restore();