Use OnceCallback on Mojo interfaces in //device/geolocation

device/geolocation/geolocation_service_impl.cc

Index: device/geolocation/geolocation_service_impl.cc
diff --git a/device/geolocation/geolocation_service_impl.cc b/device/geolocation/geolocation_service_impl.cc
index 357d9cd9fcf1b2bc383f492ccef6eea16c7349c9..ebc145dc3a7790e2c1b0beab7d8d9461a820965f 100644
--- a/device/geolocation/geolocation_service_impl.cc
+++ b/device/geolocation/geolocation_service_impl.cc
@@ -118,14 +118,14 @@ void GeolocationServiceImpl::SetHighAccuracy(bool high_accuracy) {
 }
 
 void GeolocationServiceImpl::QueryNextPosition(
-    const QueryNextPositionCallback& callback) {
+    QueryNextPositionCallback callback) {
   if (!position_callback_.is_null()) {
     DVLOG(1) << "Overlapped call to QueryNextPosition!";
     OnConnectionError();  // Simulate a connection error.
     return;
   }
 
-  position_callback_ = callback;
+  position_callback_ = std::move(callback);
 
   if (has_position_to_report_)
     ReportCurrentPosition();
@@ -178,8 +178,7 @@ void GeolocationServiceImpl::OnLocationUpdate(const Geoposition& position) {
 }
 
 void GeolocationServiceImpl::ReportCurrentPosition() {
-  position_callback_.Run(current_position_.Clone());
-  position_callback_.Reset();
+  std::move(position_callback_).Run(current_position_.Clone());
   has_position_to_report_ = false;
 }