Remove all uses of skia::RefPtr and stale includes

ui/gfx/skbitmap_operations.cc

Index: ui/gfx/skbitmap_operations.cc
diff --git a/ui/gfx/skbitmap_operations.cc b/ui/gfx/skbitmap_operations.cc
index 3b3a7e823f94def6fde65fc469eb1ab65a488b00..2b491366de4c898c57e9bb69c058db234c29ffa7 100644
--- a/ui/gfx/skbitmap_operations.cc
+++ b/ui/gfx/skbitmap_operations.cc
@@ -10,11 +10,11 @@
 #include <algorithm>
 
 #include "base/logging.h"
-#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
+#include "third_party/skia/include/core/SkRefCnt.h"

[f(malita), 2016/05/04 15:49:58]

Nit: I don't think we handle sk_sps explicitly in this file, so we probably
don't need this header.

[tomhudson, 2016/05/04 16:51:54]

Done. (At one intermediate stage we had sk_sp<SkImageFilter>, but yeah, style
says fold that into the setter when possible and I was able to here.)

 #include "third_party/skia/include/core/SkUnPreMultiply.h"
 #include "third_party/skia/include/effects/SkBlurImageFilter.h"
 #include "ui/gfx/geometry/insets.h"
@@ -740,9 +740,7 @@ SkBitmap SkBitmapOperations::CreateDropShadow(
     // The blur is halved to produce a shadow that correctly fits within the
     // |shadow_margin|.
     SkScalar sigma = SkDoubleToScalar(shadow.blur() / 2);
-    skia::RefPtr<SkImageFilter> filter =
-        skia::AdoptRef(SkBlurImageFilter::Create(sigma, sigma));
-    paint.setImageFilter(filter.get());
+    paint.setImageFilter(SkBlurImageFilter::Make(sigma, sigma, nullptr));
 
     canvas.saveLayer(0, &paint);
     canvas.drawBitmap(shadow_image,