Cleanup: Remove unneeded forward declarations from remoting.

remoting/host/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_HOST_CONFIG_H_
 #define REMOTING_HOST_HOST_CONFIG_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 
-class Task;
-
 namespace remoting {
 
 // Following constants define names for configuration parameters.
 
 // Status of the host, whether it is enabled or disabled.
 extern const char kHostEnabledConfigPath[];
 // Login used to authenticate in XMPP network.
 extern const char kXmppLoginConfigPath[];
 // Auth token used to authenticate to XMPP network.
 extern const char kXmppAuthTokenConfigPath[];
 // Auth service used to authenticate to XMPP network.
 extern const char kXmppAuthServiceConfigPath[];
 // Unique identifier of the host used to register the host in directory.
 // Normally a random UUID.
 extern const char kHostIdConfigPath[];
 // Readable host name.
 extern const char kHostNameConfigPath[];
 // Private keys used for host authentication.
 extern const char kPrivateKeyConfigPath[];
 
 // HostConfig interace provides read-only access to host configuration.
 class HostConfig : public base::RefCountedThreadSafe<HostConfig> {
  public:
-  HostConfig() { };
-  virtual ~HostConfig() { }
+  HostConfig() {}
+  virtual ~HostConfig() {}
 
   virtual bool GetString(const std::string& path, std::string* out_value) = 0;
   virtual bool GetBoolean(const std::string& path, bool* out_value) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(HostConfig);
 };
 
 // MutableHostConfig extends HostConfig for mutability.
 class MutableHostConfig : public HostConfig {
  public:
-  MutableHostConfig() { };
+  MutableHostConfig() {}
 
   // SetString() updates specified config value. Save() must be called to save
   // the changes on the disk.
   virtual void SetString(const std::string& path,
                          const std::string& in_value) = 0;
   virtual void SetBoolean(const std::string& path, bool in_value) = 0;
 
   // Save's changes.
   virtual void Save() = 0;
 
   DISALLOW_COPY_AND_ASSIGN(MutableHostConfig);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_CONFIG_H_