cc: Move SkShader construction to a single spot in PaintShader

ui/views/controls/scrollbar/cocoa_scroll_bar.mm

Index: ui/views/controls/scrollbar/cocoa_scroll_bar.mm
diff --git a/ui/views/controls/scrollbar/cocoa_scroll_bar.mm b/ui/views/controls/scrollbar/cocoa_scroll_bar.mm
index e9c1dd6aacd3d186d7a2b37b12518575b0fb93f5..c7e4cd4ac57f6baf24981ed4e54e5dbb8595031f 100644
--- a/ui/views/controls/scrollbar/cocoa_scroll_bar.mm
+++ b/ui/views/controls/scrollbar/cocoa_scroll_bar.mm
@@ -258,9 +258,9 @@ void CocoaScrollBar::OnPaint(gfx::Canvas* canvas) {
     gradient_bounds[1].set(track_rect.right(), track_rect.y());
   }
   cc::PaintFlags gradient;
-  gradient.setShader(cc::WrapSkShader(SkGradientShader::MakeLinear(
+  gradient.setShader(cc::PaintShader::MakeLinearGradient(
       gradient_bounds, kScrollerTrackGradientColors, nullptr,
-      arraysize(kScrollerTrackGradientColors), SkShader::kClamp_TileMode)));
+      arraysize(kScrollerTrackGradientColors), SkShader::kClamp_TileMode));
   canvas->DrawRect(track_rect, gradient);
 
   // Draw the inner border: top if horizontal, left if vertical.