Convert //cc from scoped_ptr to std::unique_ptr.

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index 9daded8df169b5afcd0025e6c4430aaa97d6bb6f..526c7a498e72a2b52e3eb70014116f7cd66fa74f 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -31,7 +31,7 @@ PictureLayer::PictureLayer(ContentLayerClient* client)
       nearest_neighbor_(false) {}
 
 PictureLayer::PictureLayer(ContentLayerClient* client,
-                           scoped_ptr<RecordingSource> source)
+                           std::unique_ptr<RecordingSource> source)
     : PictureLayer(client) {
   recording_source_ = std::move(source);
 }
@@ -39,7 +39,8 @@ PictureLayer::PictureLayer(ContentLayerClient* client,
 PictureLayer::~PictureLayer() {
 }
 
-scoped_ptr<LayerImpl> PictureLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
+std::unique_ptr<LayerImpl> PictureLayer::CreateLayerImpl(
+    LayerTreeImpl* tree_impl) {
   return PictureLayerImpl::Create(tree_impl, id(), is_mask_);
 }
 
@@ -135,7 +136,7 @@ sk_sp<SkPicture> PictureLayer::GetPicture() const {
     return nullptr;
 
   gfx::Size layer_size = bounds();
-  scoped_ptr<RecordingSource> recording_source(new RecordingSource);
+  std::unique_ptr<RecordingSource> recording_source(new RecordingSource);
   Region recording_invalidation;
   recording_source->UpdateAndExpandInvalidation(
       client_, &recording_invalidation, layer_size, update_source_frame_number_,