Cleanup: Remove unneeded forward declarations in base, dbug, gpu, ipc, jingle, and media.

dbus/exported_object.h

 // Copyright (c) 2011 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_EXPORTED_OBJECT_H_
 #define DBUS_EXPORTED_OBJECT_H_
 #pragma once
 
+#include <dbus/dbus.h>
+
+#include <map>
 #include <string>
-#include <map>
 #include <utility>
 
-#include <dbus/dbus.h>
-
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 
-class MessageLoop;
-
 namespace dbus {
 
 class Bus;
 class MethodCall;
 class Response;
 class Signal;
 
 // ExportedObject is used to export objects and methods to other D-Bus
 // clients.
 //
@@ skipping 118 matching lines @@
 
   // The method table where keys are absolute method names (i.e. interface
   // name + method name), and values are the corresponding callbacks.
   typedef std::map<std::string, MethodCallCallback> MethodTable;
   MethodTable method_table_;
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_EXPORTED_OBJECT_H_