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

cc/layers/layer_perftest.cc

Index: cc/layers/layer_perftest.cc
diff --git a/cc/layers/layer_perftest.cc b/cc/layers/layer_perftest.cc
index d3c119160dcd4865d468d55a1a85b4672a6824d8..237d7cf6eb953512d95c7103c72a4ed41d9f9193 100644
--- a/cc/layers/layer_perftest.cc
+++ b/cc/layers/layer_perftest.cc
@@ -51,13 +51,13 @@ class LayerPerfTest : public testing::Test {
   FakeLayerTreeHostImpl host_impl_;
 
   FakeLayerTreeHostClient fake_client_;
-  scoped_ptr<FakeLayerTreeHost> layer_tree_host_;
+  std::unique_ptr<FakeLayerTreeHost> layer_tree_host_;
   LapTimer timer_;
 };
 
 TEST_F(LayerPerfTest, PushPropertiesTo) {
   scoped_refptr<Layer> test_layer = Layer::Create();
-  scoped_ptr<LayerImpl> impl_layer =
+  std::unique_ptr<LayerImpl> impl_layer =
       LayerImpl::Create(host_impl_.active_tree(), 1);
 
   layer_tree_host_->SetRootLayer(test_layer);