Fix incorrect assertion following the move of Geolocation provider in to its own thread.

chrome/browser/geolocation/core_location_data_provider_mac.h

 // Copyright (c) 2010 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.
 
 // This file declares a CoreLocation data provider class that allows the
 // CoreLocation framework to run on the UI thread, since the Geolocation API's
 // providers all live on the IO thread
 
 #ifndef CHROME_BROWSER_GEOLOCATION_CORE_LOCATION_DATA_PROVIDER_H_
 #define CHROME_BROWSER_GEOLOCATION_CORE_LOCATION_DATA_PROVIDER_H_
@@ skipping 29 matching lines @@
   // These must execute in BrowserThread::UI
   void StartUpdatingTask();
   void StopUpdatingTask();
   // This must execute in the origin thread (IO thread)
   void PositionUpdated(Geoposition position);
 
   // The wrapper class that supplies this class with position data
   scoped_nsobject<CoreLocationWrapperMac> wrapper_;
   // The LocationProviderBase class that should receive position data
   CoreLocationProviderMac* provider_;
-  BrowserThread::ID origin_thread_id_;
 };
 
 #endif