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

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

Index: chrome/browser/ui/views/tabs/dragged_tab_view.cc
diff --git a/chrome/browser/ui/views/tabs/dragged_tab_view.cc b/chrome/browser/ui/views/tabs/dragged_tab_view.cc
index 031ef172f95e8bb67e63bb08f733c40b140fa40f..64a7ab842e140fd7e395ff35ff7433ed0704b416 100644
--- a/chrome/browser/ui/views/tabs/dragged_tab_view.cc
+++ b/chrome/browser/ui/views/tabs/dragged_tab_view.cc
@@ -155,7 +155,7 @@ void DraggedTabView::PaintDetachedView(gfx::Canvas* canvas) {
   SkBitmap mipmap = scale_canvas.ExtractImageRep().sk_bitmap();
   mipmap.buildMipMap(true);
 
-  SkShader* bitmap_shader =
+  skia::RefPtr<SkShader> bitmap_shader =
       SkShader::CreateBitmapShader(mipmap, SkShader::kClamp_TileMode,
                                    SkShader::kClamp_TileMode);
 
@@ -164,9 +164,8 @@ void DraggedTabView::PaintDetachedView(gfx::Canvas* canvas) {
   bitmap_shader->setLocalMatrix(shader_scale);
 
   SkPaint paint;
-  paint.setShader(bitmap_shader);
+  paint.setShader(bitmap_shader.get());
   paint.setAntiAlias(true);
-  bitmap_shader->unref();
 
   canvas->DrawRect(gfx::Rect(ps), paint);
 }