Fix build break when building with enable_openvr=true on Windows

device/vr/openvr/openvr_device.cc

 // Copyright (c) 2017 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.
 
 #define _USE_MATH_DEFINES  // for M_PI
 #include "device/vr/openvr/openvr_device.h"
 #include <math.h>
 #include "third_party/openvr/src/headers/openvr.h"
 
 namespace {
@@ skipping 278 matching lines @@
     return;
 
   on_polling_events_ = onPollingEvents;
 }
 
 void OpenVRDevice::OpenVRRenderLoop::UnregisterPollingEventCallback() {
   on_polling_events_.Reset();
 }
 
 void OpenVRDevice::OpenVRRenderLoop::GetVSync(
-    const mojom::VRVSyncProvider::GetVSyncCallback& callback) {
+    mojom::VRVSyncProvider::GetVSyncCallback callback) {
   static int16_t next_frame = 0;
   int16_t frame = next_frame++;
 
   // VSync could be used as a signal to poll events.
   if (!on_polling_events_.is_null()) {
     main_thread_task_runner_->PostTask(FROM_HERE, on_polling_events_);
   }
 
   // TODO(BillOrr): Give real values when VSync loop is hooked up.  This is the
   // presentation time for the frame. Just returning a default value for now
   // since we don't have VSync hooked up.
   base::TimeDelta time = base::TimeDelta::FromSecondsD(2.0);
 
   device::mojom::VRPosePtr pose = getPose();
   Sleep(11);  // TODO (billorr): Use real vsync timing instead of a sleep (this
               // sleep just throttles vsyncs so we don't fill message queues).
-  callback.Run(std::move(pose), time, frame,
-               device::mojom::VRVSyncProvider::Status::SUCCESS);
+  std::move(callback).Run(std::move(pose), time, frame,
+                          device::mojom::VRVSyncProvider::Status::SUCCESS);
 }
 
 }  // namespace device