Cleanup: Remove unneeded forward declarations from remoting.

remoting/protocol/util.h

Index: remoting/protocol/util.h
===================================================================
--- remoting/protocol/util.h	(revision 109590)
+++ remoting/protocol/util.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -11,8 +11,6 @@
 #include "net/base/io_buffer.h"
 #include "third_party/protobuf/src/google/protobuf/message_lite.h"
 
-class Task;
-
 namespace remoting {
 namespace protocol {