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

cc/trees/layer_tree_host_unittest_serialization.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "cc/layers/heads_up_display_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/proto/layer.pb.h"
 #include "cc/proto/layer_tree_host.pb.h"
@@ skipping 331 matching lines @@
     layer_src_root->AddChild(layer_src_c);
     layer_src_c->AddChild(layer_src_d);
 
     VerifySerializationAndDeserialization();
     VerifyHostHasAllExpectedLayersInTree(layer_tree_host_dst_->root_layer());
   }
 
  private:
   TestTaskGraphRunner task_graph_runner_src_;
   FakeLayerTreeHostClient client_src_;
-  scoped_ptr<LayerTreeHost> layer_tree_host_src_;
+  std::unique_ptr<LayerTreeHost> layer_tree_host_src_;
 
   TestTaskGraphRunner task_graph_runner_dst_;
   FakeLayerTreeHostClient client_dst_;
-  scoped_ptr<LayerTreeHost> layer_tree_host_dst_;
+  std::unique_ptr<LayerTreeHost> layer_tree_host_dst_;
 };
 
 TEST_F(LayerTreeHostSerializationTest, AllMembersChanged) {
   RunAllMembersChangedTest();
 }
 
 TEST_F(LayerTreeHostSerializationTest, LayersChanged) {
   RunLayersChangedTest();
 }
 
 TEST_F(LayerTreeHostSerializationTest, LayersChangedMultipleSerializations) {
   RunLayersChangedMultipleSerializations();
 }
 
 TEST_F(LayerTreeHostSerializationTest, AddAndRemoveNodeFromLayerTree) {
   RunAddAndRemoveNodeFromLayerTree();
 }
 
 }  // namespace cc