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

chrome/browser/chromeos/login/rounded_rect_painter.cc

Index: chrome/browser/chromeos/login/rounded_rect_painter.cc
diff --git a/chrome/browser/chromeos/login/rounded_rect_painter.cc b/chrome/browser/chromeos/login/rounded_rect_painter.cc
index 4da680d900766a1b58fc9119ccb050a07c1f9514..d833d72911e71f870d3b80cffc5a2c1040362e14 100644
--- a/chrome/browser/chromeos/login/rounded_rect_painter.cc
+++ b/chrome/browser/chromeos/login/rounded_rect_painter.cc
@@ -38,11 +38,9 @@ void DrawRoundedRect(gfx::Canvas* canvas,
     p[0].set(SkIntToScalar(rect.left()), SkIntToScalar(rect.top()));
     p[1].set(SkIntToScalar(rect.left()), SkIntToScalar(rect.bottom()));
     SkColor colors[2] = { top_color, bottom_color };
-    SkShader* s = SkGradientShader::CreateLinear(p, colors, NULL, 2,
-        SkShader::kClamp_TileMode, NULL);
-    paint.setShader(s);
-    // Need to unref shader, otherwise never deleted.
-    s->unref();
+    skia::RefPtr<SkShader> s = SkGradientShader::CreateLinear(
+        p, colors, NULL, 2, SkShader::kClamp_TileMode, NULL);
+    paint.setShader(s.get());
   } else {
     paint.setColor(top_color);
   }
@@ -59,9 +57,9 @@ void DrawRoundedRectShadow(gfx::Canvas* canvas,
   paint.setFlags(SkPaint::kAntiAlias_Flag);
   paint.setStyle(SkPaint::kFill_Style);
   paint.setColor(color);
-  SkMaskFilter* filter = SkBlurMaskFilter::Create(
+  skia::RefPtr<SkMaskFilter> filter = SkBlurMaskFilter::Create(
       shadow / 2, SkBlurMaskFilter::kNormal_BlurStyle);
-  paint.setMaskFilter(filter)->unref();
+  paint.setMaskFilter(filter.get());
   SkRect inset_rect(rect);
   inset_rect.inset(SkIntToScalar(shadow / 2), SkIntToScalar(shadow / 2));
   canvas->sk_canvas()->drawRoundRect(