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

chrome/browser/ui/gtk/infobars/infobar_container_gtk.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/infobars/infobar_container_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <utility>
 
@@ skipping 161 matching lines @@
   SkPoint grad_points[2];
   grad_points[0].set(SkIntToScalar(0), SkIntToScalar(bounds.bottom()));
   grad_points[1].set(SkIntToScalar(0),
                      SkIntToScalar(bounds.bottom() +
                                    source->arrow_target_height()));
 
   SkColor grad_colors[2];
   grad_colors[0] = source->ConvertGetColor(&InfoBarGtk::GetTopColor);
   grad_colors[1] = source->ConvertGetColor(&InfoBarGtk::GetBottomColor);
 
-  SkShader* gradient_shader = SkGradientShader::CreateLinear(
+  skia::RefPtr<SkShader> gradient_shader = SkGradientShader::CreateLinear(
       grad_points, grad_colors, NULL, 2, SkShader::kMirror_TileMode);
-  paint.setShader(gradient_shader);
-  gradient_shader->unref();
+  paint.setShader(gradient_shader.get());
 
   gfx::CanvasSkiaPaint canvas_paint(expose, false);
   SkCanvas& canvas = *canvas_paint.sk_canvas();
 
   canvas.drawPath(path, paint);
 
   paint.setShader(NULL);
   paint.setColor(SkColorSetA(gfx::GdkColorToSkColor(source->GetBorderColor()),
                              SkColorGetA(grad_colors[0])));
   paint.setStyle(SkPaint::kStroke_Style);
   canvas.drawPath(path, paint);
 }