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

chrome/browser/ui/views/tabs/tab.cc

Index: chrome/browser/ui/views/tabs/tab.cc
diff --git a/chrome/browser/ui/views/tabs/tab.cc b/chrome/browser/ui/views/tabs/tab.cc
index 7e39d6692139142c8a6e172629f7dbe4a91b7a60..30cf62c0d981ff468ad37c3782021e707d87b917 100644
--- a/chrome/browser/ui/views/tabs/tab.cc
+++ b/chrome/browser/ui/views/tabs/tab.cc
@@ -1100,11 +1100,10 @@ void Tab::PaintInactiveTabBackgroundWithTitleChange(gfx::Canvas* canvas) {
   center_point.iset(x, 0);
   SkColor colors[2] = { kMiniTitleChangeGradientColor1,
                         kMiniTitleChangeGradientColor2 };
-  SkShader* shader = SkGradientShader::CreateRadial(center_point,
+  skia::RefPtr<SkShader> shader = SkGradientShader::CreateRadial(center_point,
       SkIntToScalar(radius), colors, NULL, 2, SkShader::kClamp_TileMode);
   SkPaint paint;
-  paint.setShader(shader);
-  shader->unref();
+  paint.setShader(shader.get());
   hover_canvas.DrawRect(gfx::Rect(x - radius, -radius, radius * 2, radius * 2),
                         paint);