Use std::move() instead of .Pass() in remoting/host

remoting/host/host_window_proxy.cc

Index: remoting/host/host_window_proxy.cc
diff --git a/remoting/host/host_window_proxy.cc b/remoting/host/host_window_proxy.cc
index e5be61676e626eeb06a6663c4b6510c01f113227..00edf8228ceb759a25d0c24758de8ef6df942001 100644
--- a/remoting/host/host_window_proxy.cc
+++ b/remoting/host/host_window_proxy.cc
@@ -74,7 +74,7 @@ HostWindowProxy::HostWindowProxy(
   // Detach |host_window| from the calling thread so that |Core| could run it on
   // the |ui_task_runner_| thread.
   host_window->DetachFromThread();
-  core_ = new Core(caller_task_runner, ui_task_runner, host_window.Pass());
+  core_ = new Core(caller_task_runner, ui_task_runner, std::move(host_window));
 }
 
 HostWindowProxy::~HostWindowProxy() {
@@ -96,7 +96,7 @@ HostWindowProxy::Core::Core(
     scoped_ptr<HostWindow> host_window)
     : caller_task_runner_(caller_task_runner),
       ui_task_runner_(ui_task_runner),
-      host_window_(host_window.Pass()),
+      host_window_(std::move(host_window)),
       weak_factory_(this) {
   DCHECK(caller_task_runner->BelongsToCurrentThread());
 }