Revert of Remove calls to MessageLoop::current() in content.

content/browser/geolocation/geolocation_provider_impl.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_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 74 matching lines @@
       base::Bind(&GeolocationProviderImpl::OnClientsChanged,
                  base::Unretained(this)));
 }
 
 GeolocationProviderImpl::~GeolocationProviderImpl() {
   Stop();
   DCHECK(!arbitrator_);
 }
 
 bool GeolocationProviderImpl::OnGeolocationThread() const {
-  return task_runner()->BelongsToCurrentThread();
+  return base::MessageLoop::current() == message_loop();
 }
 
 void GeolocationProviderImpl::OnClientsChanged() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   base::Closure task;
   if (high_accuracy_callbacks_.empty() && low_accuracy_callbacks_.empty()) {
     DCHECK(IsRunning());
     if (!ignore_location_updates_) {
       // 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.
@@ skipping 65 matching lines @@
 }
 
 std::unique_ptr<LocationArbitrator>
 GeolocationProviderImpl::CreateArbitrator() {
   LocationArbitratorImpl::LocationUpdateCallback callback = base::Bind(
       &GeolocationProviderImpl::OnLocationUpdate, base::Unretained(this));
   return base::WrapUnique(new LocationArbitratorImpl(callback));
 }
 
 }  // namespace content