cc: Use skia::RefPtr in place of raw pointers and SkAutoTUnref.

cc/picture.cc

Index: cc/picture.cc
diff --git a/cc/picture.cc b/cc/picture.cc
index 50eefd867096b0a492e579052da5dbc14028d5b2..b7445e62f68774b9e29914608a870beba504a76b 100644
--- a/cc/picture.cc
+++ b/cc/picture.cc
@@ -18,7 +18,8 @@ scoped_refptr<Picture> Picture::Create() {
 Picture::Picture() {
 }
 
-Picture::Picture(SkPicture* picture, gfx::Rect layer_rect,
+Picture::Picture(const skia::RefPtr<SkPicture>& picture,
+                 gfx::Rect layer_rect,
                  gfx::Rect opaque_rect) :
     layer_rect_(layer_rect),
     opaque_rect_(opaque_rect),
@@ -31,8 +32,8 @@ Picture::~Picture() {
 scoped_refptr<Picture> Picture::Clone() {
   // SkPicture is not thread-safe to rasterize with, so return a thread-safe
   // clone of it.
-  DCHECK(picture_.get());
-  SkPicture* clone = picture_->clone();
+  DCHECK(picture_);
+  skia::RefPtr<SkPicture> clone = skia::AdoptRef(picture_->clone());
   return make_scoped_refptr(new Picture(clone, layer_rect_, opaque_rect_));
 }
 
@@ -41,8 +42,8 @@ void Picture::Record(ContentLayerClient* painter, gfx::Rect layer_rect,
   TRACE_EVENT0("cc", "Picture::Record");
 
   // Record() should only be called once.
-  DCHECK(!picture_.get());
-  picture_.reset(new SkPicture);
+  DCHECK(!picture_);
+  picture_ = skia::AdoptRef(new SkPicture);
 
   SkCanvas* canvas = picture_->beginRecording(
       layer_rect.width(),
@@ -80,7 +81,7 @@ void Picture::Record(ContentLayerClient* painter, gfx::Rect layer_rect,
 
 void Picture::Raster(SkCanvas* canvas) {
   TRACE_EVENT0("cc", "Picture::Raster");
-  DCHECK(picture_.get());
+  DCHECK(picture_);
   canvas->save();
   canvas->translate(layer_rect_.x(), layer_rect_.y());
   canvas->drawPicture(*picture_);