Cleanup: Remove unneeded forward declarations from remoting.

remoting/host/in_memory_host_config.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 REMOTING_HOST_IN_MEMORY_HOST_CONFIG_H_
 #define REMOTING_HOST_IN_MEMORY_HOST_CONFIG_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "remoting/host/host_config.h"
 
-class Task;
-
 namespace base {
 class DictionaryValue;
 }
 
 namespace remoting {
 
 // In-memory host config. Used by unittests.
 class InMemoryHostConfig : public MutableHostConfig {
  public:
   InMemoryHostConfig();
@@ skipping 13 matching lines @@
   base::Lock lock_;
   scoped_ptr<base::DictionaryValue> values_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InMemoryHostConfig);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IN_MEMORY_HOST_CONFIG_H_