Stop using [Client=...] feature of Mojom for GeolocationService

content/common/geolocation_service.mojom

 // Copyright 2014 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.
 
 module content;
 
 import "content/public/common/mojo_geoposition.mojom";
 
-// The Geolocation service provides updates on the device's location to its
-// client. By default, it provides updates with low accuracy, but
-// |SetHighAccuracy()| can be called to change this.
-[Client=GeolocationServiceClient]
+// The Geolocation service provides updates on the device's location.  By
+// default, it provides updates with low accuracy, but |SetHighAccuracy()| may
+// be called to change this.
 interface GeolocationService {
   SetHighAccuracy(bool high_accuracy);
+
+  // Position is reported once it changes or immediately (to report the initial
+  // position) if this is the first call to QueryNextPosition on this instance.
+  // Position updates may be throttled by the service. Overlapping calls to
+  // this method are supported.
+  QueryNextPosition() => (MojoGeoposition geoposition);
 };
-
-interface GeolocationServiceClient {
-  OnLocationUpdate(MojoGeoposition geoposition);
-};