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

remoting/host/pam_authorization_factory_posix.cc

 // 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.
 
 #include "remoting/host/pam_authorization_factory_posix.h"
 
 #include <security/pam_appl.h>
 
 #include "base/environment.h"
 #include "base/logging.h"
 #include "remoting/protocol/channel_authenticator.h"
 #include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
 
 namespace remoting {
 
 namespace {
 class PamAuthorizer : public protocol::Authenticator {
  public:
-  PamAuthorizer(scoped_ptr<protocol::Authenticator> underlying);
+  explicit PamAuthorizer(scoped_ptr<protocol::Authenticator> underlying);
   virtual ~PamAuthorizer();
 
   // protocol::Authenticator interface.
   virtual State state() const OVERRIDE;
   virtual RejectionReason rejection_reason() const OVERRIDE;
   virtual void ProcessMessage(const buzz::XmlElement* message) OVERRIDE;
   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
   virtual scoped_ptr<protocol::ChannelAuthenticator>
       CreateChannelAuthenticator() const OVERRIDE;
 
@@ skipping 123 matching lines @@
     const std::string& remote_jid,
     const buzz::XmlElement* first_message) {
   scoped_ptr<protocol::Authenticator> authenticator(
       underlying_->CreateAuthenticator(local_jid, remote_jid, first_message));
   return scoped_ptr<protocol::Authenticator>(
       new PamAuthorizer(authenticator.Pass()));
 }
 
 
 }  // namespace remoting