Re-write many calls to WrapUnique() with MakeUnique()

cc/trees/threaded_channel.cc

Index: cc/trees/threaded_channel.cc
diff --git a/cc/trees/threaded_channel.cc b/cc/trees/threaded_channel.cc
index 0ee9469674b6b1295b003bd065f16160769a9d72..113da6fd2cff501eb488b79915d8ffb0beeece53 100644
--- a/cc/trees/threaded_channel.cc
+++ b/cc/trees/threaded_channel.cc
@@ -287,8 +287,9 @@ void ThreadedChannel::InitializeImplOnImpl(
   impl().proxy_impl =
       CreateProxyImpl(this, layer_tree_host, task_runner_provider_,
                       std::move(external_begin_frame_source));
-  impl().proxy_impl_weak_factory = base::WrapUnique(
-      new base::WeakPtrFactory<ProxyImpl>(impl().proxy_impl.get()));
+  impl().proxy_impl_weak_factory =
+      base::MakeUnique<base::WeakPtrFactory<ProxyImpl>>(
+          impl().proxy_impl.get());
   proxy_impl_weak_ptr_ = impl().proxy_impl_weak_factory->GetWeakPtr();
   completion->Signal();
 }