Cleanup remaining class/struct fwd declarations

dbus/bus.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 DBUS_BUS_H_
 #define DBUS_BUS_H_
 
 #include <dbus/dbus.h>
 #include <stdint.h>
 
@@ skipping 10 matching lines @@
 #include "base/threading/platform_thread.h"
 #include "dbus/dbus_export.h"
 #include "dbus/object_path.h"
 
 namespace base {
 class SequencedTaskRunner;
 class SingleThreadTaskRunner;
 class TaskRunner;
 }
 
-namespace tracked_objects {
-class Location;
-}
-
 namespace dbus {
 
 class ExportedObject;
 class ObjectManager;
 class ObjectProxy;
 
 // Bus is used to establish a connection with D-Bus, create object
 // proxies, and export objects.
 //
 // For asynchronous operations such as an asynchronous method call, the
@@ skipping 706 matching lines @@
   int num_pending_timeouts_;
 
   std::string address_;
 
   DISALLOW_COPY_AND_ASSIGN(Bus);
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_BUS_H_