Fix comment to match implementation.

content/browser/geolocation/geolocation_provider_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
 #define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 19 matching lines @@
       AddLocationUpdateCallback(const LocationUpdateCallback& callback,
                                 bool use_high_accuracy) OVERRIDE;
   virtual void UserDidOptIntoLocationServices() OVERRIDE;
   virtual void OverrideLocationForTesting(const Geoposition& position) OVERRIDE;
 
   // Callback from the LocationArbitrator. Public for testing.
   void OnLocationUpdate(const Geoposition& position);
 
   // Gets a pointer to the singleton instance of the location relayer, which
   // is in turn bound to the browser's global context objects. This must only be
-  // called on the IO thread so that the GeolocationProviderImpl is always
+  // called on the UI thread so that the GeolocationProviderImpl is always
   // instantiated on the same thread. Ownership is NOT returned.
   static GeolocationProviderImpl* GetInstance();
 
   bool user_did_opt_into_location_services_for_testing() {
     return user_did_opt_into_location_services_;
   }
 
  protected:
   friend struct DefaultSingletonTraits<GeolocationProviderImpl>;
   GeolocationProviderImpl();
@@ skipping 38 matching lines @@
 
   // Only to be used on the geolocation thread.
   LocationArbitrator* arbitrator_;
 
   DISALLOW_COPY_AND_ASSIGN(GeolocationProviderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_