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

cc/layers/layer_proto_converter_unittest.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/layers/layer_proto_converter.h"
 
 #include "cc/layers/empty_content_layer_client.h"
 #include "cc/layers/heads_up_display_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/picture_layer.h"
@@ skipping 17 matching lines @@
         FakeLayerTreeHost::Create(&fake_client_, &task_graph_runner_);
   }
 
   void TearDown() override {
     layer_tree_host_->SetRootLayer(nullptr);
     layer_tree_host_ = nullptr;
   }
 
   TestTaskGraphRunner task_graph_runner_;
   FakeLayerTreeHostClient fake_client_;
-  scoped_ptr<FakeLayerTreeHost> layer_tree_host_;
+  std::unique_ptr<FakeLayerTreeHost> layer_tree_host_;
 };
 
 TEST_F(LayerProtoConverterTest, TestKeepingRoot) {
   /* Test deserialization of a tree that looks like:
          root
         /   \
        a     b
               \
                c
      The old root node will be reused during deserialization.
@@ skipping 347 matching lines @@
   // serialize to.
   proto::LayerNode layer_node;
   new_root->SetTypeForProtoSerialization(&layer_node);
   EXPECT_EQ(proto::LayerNode::HEADS_UP_DISPLAY_LAYER, layer_node.type());
 
   new_root->SetLayerTreeHost(nullptr);
 }
 
 }  // namespace
 }  // namespace cc