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

chrome/browser/ui/omnibox/location_bar_util.cc

Index: chrome/browser/ui/omnibox/location_bar_util.cc
diff --git a/chrome/browser/ui/omnibox/location_bar_util.cc b/chrome/browser/ui/omnibox/location_bar_util.cc
index e02468d3700568425d09e6f3a4c412acc0deec24..af33b9f5bf1a490b8228f66a2eddebfe5bf563cd 100644
--- a/chrome/browser/ui/omnibox/location_bar_util.cc
+++ b/chrome/browser/ui/omnibox/location_bar_util.cc
@@ -50,11 +50,10 @@ void PaintExtensionActionBackground(const ExtensionAction& action,
     color_utils::AlphaBlend(text_color, background_color, 0x13),
     color_utils::AlphaBlend(text_color, background_color, 0x1d)
   };
-  SkShader* gradient = SkGradientShader::CreateLinear(
+  skia::RefPtr<SkShader> gradient = SkGradientShader::CreateLinear(
       gradient_bounds, gradient_colors, NULL, 2, SkShader::kClamp_TileMode);
   SkPaint paint;
-  paint.setShader(gradient);
-  gradient->unref();
+  paint.setShader(gradient.get());
   canvas->DrawRect(bounds, paint);
 
   SkColor border_color =