Replace many skia::RefPtr with sk_sp<> in cc/

cc/playback/discardable_image_map.h

Index: cc/playback/discardable_image_map.h
diff --git a/cc/playback/discardable_image_map.h b/cc/playback/discardable_image_map.h
index 3b29da20b4260aa0eafeb04aef9fdb50f739f6ed..34316309fd7b42975f43db4ce64c7086d252e6a5 100644
--- a/cc/playback/discardable_image_map.h
+++ b/cc/playback/discardable_image_map.h
@@ -11,7 +11,6 @@
 #include "cc/base/cc_export.h"
 #include "cc/base/rtree.h"
 #include "cc/playback/draw_image.h"
-#include "skia/ext/refptr.h"

[danakj, 2016/04/14 19:37:32]

we should technically be including SkRefCnt.h in every place that uses sk_sp.
might come back to bite you that you're not (it's been a huuuge pain for
scoped_ptr.h)

[tomhudson, 2016/04/25 20:48:13]

Done.

 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gfx/geometry/rect.h"
@@ -39,7 +38,7 @@ class CC_EXPORT DiscardableImageMap {
 
    private:
     DiscardableImageMap* image_map_;
-    skia::RefPtr<SkCanvas> metadata_canvas_;
+    sk_sp<SkCanvas> metadata_canvas_;
   };
 
   DiscardableImageMap();
@@ -54,7 +53,7 @@ class CC_EXPORT DiscardableImageMap {
   friend class ScopedMetadataGenerator;
   friend class DiscardableImageMapTest;
 
-  skia::RefPtr<SkCanvas> BeginGeneratingMetadata(const gfx::Size& bounds);
+  sk_sp<SkCanvas> BeginGeneratingMetadata(const gfx::Size& bounds);
   void EndGeneratingMetadata();
 
   std::vector<std::pair<DrawImage, gfx::Rect>> all_images_;