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

chrome/browser/ui/views/theme_helpers.cc

Index: chrome/browser/ui/views/theme_helpers.cc
diff --git a/chrome/browser/ui/views/theme_helpers.cc b/chrome/browser/ui/views/theme_helpers.cc
index 833f49c28bb95083c1fad1a8cd6ba9ec9860b5f8..7d80be6e0523383abc968f5a1fd7c92fdb6ce70c 100644
--- a/chrome/browser/ui/views/theme_helpers.cc
+++ b/chrome/browser/ui/views/theme_helpers.cc
@@ -49,13 +49,12 @@ void GetRebarGradientColors(int width, int x1, int x2,
     SkPoint grad_points[2];
     grad_points[0].set(SkIntToScalar(0), SkIntToScalar(0));
     grad_points[1].set(SkIntToScalar(width), SkIntToScalar(0));
-    SkShader* gradient_shader = SkGradientShader::CreateLinear(
+    skia::RefPtr<SkShader> gradient_shader = SkGradientShader::CreateLinear(
         grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode);
     SkPaint paint;
-    paint.setShader(gradient_shader);
+    paint.setShader(gradient_shader.get());
     // Shader created with a ref count of 1, release as the paint now owns
     // the gradient.
-    gradient_shader->unref();
     paint.setStyle(SkPaint::kFill_Style);
     canvas.sk_canvas()->drawRectCoords(
         SkIntToScalar(0), SkIntToScalar(0),