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

chrome/browser/ui/views/infobars/infobar_background.cc

Index: chrome/browser/ui/views/infobars/infobar_background.cc
diff --git a/chrome/browser/ui/views/infobars/infobar_background.cc b/chrome/browser/ui/views/infobars/infobar_background.cc
index 7591d8433596a05d1114bc75f8cd06ff162c9304..d3ac4821d75d2a70c6ed7c35f765a1e1101445cc 100644
--- a/chrome/browser/ui/views/infobars/infobar_background.cc
+++ b/chrome/browser/ui/views/infobars/infobar_background.cc
@@ -24,14 +24,13 @@ void InfoBarBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
   gradient_points[0].iset(0, 0);
   gradient_points[1].iset(0, view->height());
   SkColor gradient_colors[2] = { top_color_, bottom_color_ };
-  SkShader* gradient_shader = SkGradientShader::CreateLinear(
+  skia::RefPtr<SkShader> gradient_shader = SkGradientShader::CreateLinear(
       gradient_points, gradient_colors, NULL, 2, SkShader::kClamp_TileMode);
   SkPaint paint;
   paint.setStrokeWidth(SkIntToScalar(InfoBar::kSeparatorLineHeight));
   paint.setStyle(SkPaint::kFill_Style);
   paint.setStrokeCap(SkPaint::kRound_Cap);
-  paint.setShader(gradient_shader);
-  gradient_shader->unref();
+  paint.setShader(gradient_shader.get());
 
   InfoBarView* infobar = static_cast<InfoBarView*>(view);
   SkCanvas* canvas_skia = canvas->sk_canvas();