Add missing (and remove superfluous) 'explicit' from constructors.

remoting/protocol/ssl_hmac_channel_authenticator.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 REMOTING_PROTOCOL_SSL_HMAC_CHANNEL_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_SSL_HMAC_CHANNEL_AUTHENTICATOR_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 44 matching lines @@
       const std::string& auth_key);
 
   virtual ~SslHmacChannelAuthenticator();
 
   // ChannelAuthenticator interface.
   virtual void SecureAndAuthenticate(
       scoped_ptr<net::StreamSocket> socket,
       const DoneCallback& done_callback) OVERRIDE;
 
  private:
-  SslHmacChannelAuthenticator(const std::string& auth_key);
+  explicit SslHmacChannelAuthenticator(const std::string& auth_key);
 
   bool is_ssl_server();
 
   void OnConnected(int result);
 
   void WriteAuthenticationBytes(bool* callback_called);
   void OnAuthBytesWritten(int result);
   bool HandleAuthBytesWritten(int result, bool* callback_called);
 
   void ReadAuthenticationBytes();
@@ skipping 21 matching lines @@
   scoped_refptr<net::DrainableIOBuffer> auth_write_buf_;
   scoped_refptr<net::GrowableIOBuffer> auth_read_buf_;
 
   DISALLOW_COPY_AND_ASSIGN(SslHmacChannelAuthenticator);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_SSL_HMAC_CHANNEL_AUTHENTICATOR_H_