Do not send stale position in GeolocationProvider::AddObserver.

content/browser/geolocation/geolocation_provider.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/geolocation/geolocation_provider.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 85 matching lines @@
 
 bool GeolocationProvider::OnGeolocationThread() const {
   return MessageLoop::current() == message_loop();
 }
 
 void GeolocationProvider::OnClientsChanged() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   base::Closure task;
   if (observers_.empty() && callbacks_.empty()) {
     DCHECK(IsRunning());
+    // We have no more observers, so we clear the cached geoposition so that
+    // when the next observer is added we will not provide a stale position.
+    position_ = Geoposition();
     task = base::Bind(&GeolocationProvider::StopProviders,
                       base::Unretained(this));
   } else {
     if (!IsRunning()) {
       Start();
       if (HasPermissionBeenGranted())
         InformProvidersPermissionGranted();
     }
     // Determine a set of options that satisfies all clients.
     GeolocationObserverOptions options =
@@ skipping 74 matching lines @@
   DCHECK(OnGeolocationThread());
   delete arbitrator_;
   arbitrator_ = NULL;
 }
 
 GeolocationArbitrator* GeolocationProvider::CreateArbitrator() {
   return new GeolocationArbitratorImpl(this);
 }
 
 }  // namespace content