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

remoting/host/service_client.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_HOST_SERVICE_CLIENT_H_
 #define REMOTING_HOST_SERVICE_CLIENT_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 16 matching lines @@
     virtual void OnHostUnregistered() = 0;
     // Invoked when there is an OAuth error.
     virtual void OnOAuthError() = 0;
     // Invoked when there is a network error or upon receiving an invalid
     // response.
     virtual void OnNetworkError(int response_code) = 0;
 
    protected:
     virtual ~Delegate() {}
   };
-  ServiceClient(net::URLRequestContextGetter* context_getter);
+  explicit ServiceClient(net::URLRequestContextGetter* context_getter);
   ~ServiceClient();
 
   // Register a host.
   void RegisterHost(const std::string& host_id,
                     const std::string& host_name,
                     const std::string& public_key,
                     const std::string& oauth_access_token,
                     Delegate* delegate);
   // Unregister a host.
   void UnregisterHost(const std::string& host_id,
                       const std::string& oauth_access_token,
                       Delegate* delegate);
 
  private:
   // The guts of the implementation live in this class.
   class Core;
   scoped_refptr<Core> core_;
   DISALLOW_COPY_AND_ASSIGN(ServiceClient);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SERVICE_CLIENT_H_