Add skia::RefPtr class to wrap ref counted classes from Skia.

ui/views/touchui/touch_selection_controller_impl.cc

Index: ui/views/touchui/touch_selection_controller_impl.cc
diff --git a/ui/views/touchui/touch_selection_controller_impl.cc b/ui/views/touchui/touch_selection_controller_impl.cc
index 4b06e0945c9da42117676912e47122d45bd390e6..4c10fb5c71c1e40d7ce77642a476685d9f7b3b78 100644
--- a/ui/views/touchui/touch_selection_controller_impl.cc
+++ b/ui/views/touchui/touch_selection_controller_impl.cc
@@ -253,14 +253,13 @@ class TouchSelectionControllerImpl::TouchContextMenuView
     points[0].iset(0, 0);
     points[1].iset(0, height());
 
-    SkShader* shader = SkGradientShader::CreateLinear(points,
+    skia::RefPtr<SkShader> shader = SkGradientShader::CreateLinear(points,
         kGradientColors, kGradientPoints, arraysize(kGradientPoints),
         SkShader::kRepeat_TileMode);
     DCHECK(shader);
 
     SkPaint paint;
-    paint.setShader(shader);
-    shader->unref();
+    paint.setShader(shader.get());
 
     paint.setStyle(SkPaint::kFill_Style);
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);