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

ui/views/controls/glow_hover_controller.cc

Index: ui/views/controls/glow_hover_controller.cc
diff --git a/ui/views/controls/glow_hover_controller.cc b/ui/views/controls/glow_hover_controller.cc
index 71785f064395de757a9763ed018b9a807bfe02db..44a4de92ff295257db9d738f6b3844e555cbf78a 100644
--- a/ui/views/controls/glow_hover_controller.cc
+++ b/ui/views/controls/glow_hover_controller.cc
@@ -83,7 +83,7 @@ void GlowHoverController::Draw(gfx::Canvas* canvas,
       static_cast<int>(255 * kOpacityScale * animation_.GetCurrentValue());
   colors[0] = SkColorSetARGB(hover_alpha, 255, 255, 255);
   colors[1] = SkColorSetARGB(0, 255, 255, 255);
-  SkShader* shader = SkGradientShader::CreateRadial(center_point,
+  skia::RefPtr<SkShader> shader = SkGradientShader::CreateRadial(center_point,
       SkIntToScalar(radius), colors, NULL, 2, SkShader::kClamp_TileMode);
   // Shader can end up null when radius = 0.
   // If so, this results in default full tab glow behavior.
@@ -91,8 +91,7 @@ void GlowHoverController::Draw(gfx::Canvas* canvas,
     SkPaint paint;
     paint.setStyle(SkPaint::kFill_Style);
     paint.setAntiAlias(true);
-    paint.setShader(shader);
-    shader->unref();
+    paint.setShader(shader.get());
     hover_canvas.DrawRect(gfx::Rect(location_.x() - radius,
                                     location_.y() - radius,
                                     radius * 2, radius * 2), paint);