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

cc/layers/layer_collections.h

Index: cc/layers/layer_collections.h
diff --git a/cc/layers/layer_collections.h b/cc/layers/layer_collections.h
index 6830261629e6713dd531a3979831727bec134689..23c6c10d0a119b4005c1eb4b21d664578165520a 100644
--- a/cc/layers/layer_collections.h
+++ b/cc/layers/layer_collections.h
@@ -5,11 +5,11 @@
 #ifndef CC_LAYERS_LAYER_COLLECTIONS_H_
 #define CC_LAYERS_LAYER_COLLECTIONS_H_
 
+#include <memory>
 #include <unordered_map>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
@@ -17,9 +17,9 @@ class Layer;
 class LayerImpl;
 
 using LayerList = std::vector<scoped_refptr<Layer>>;
-using OwnedLayerImplList = std::vector<scoped_ptr<LayerImpl>>;
+using OwnedLayerImplList = std::vector<std::unique_ptr<LayerImpl>>;
 using LayerImplList = std::vector<LayerImpl*>;
-using OwnedLayerImplMap = std::unordered_map<int, scoped_ptr<LayerImpl>>;
+using OwnedLayerImplMap = std::unordered_map<int, std::unique_ptr<LayerImpl>>;
 using LayerImplMap = std::unordered_map<int, LayerImpl*>;
 
 }  // namespace cc