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

remoting/client/plugin/pepper_network_manager.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_CLIENT_PLUGIN_PEPPER_NETWORK_MANAGER_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_NETWORK_MANAGER_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/private/network_monitor_private.h"
 #include "third_party/libjingle/source/talk/base/network.h"
 
 namespace pp {
 class NetworkListPrivate;
 }  // namespace pp
 
 namespace remoting {
 
 // PepperNetworkManager uses the PPB_NetworkMonitor_Private API to
 // implement the NetworkManager interface that libjingle uses to
 // monitor the host system's network interfaces.
 class PepperNetworkManager : public talk_base::NetworkManagerBase {
  public:
-  PepperNetworkManager(const pp::InstanceHandle& instance);
+  explicit PepperNetworkManager(const pp::InstanceHandle& instance);
   virtual ~PepperNetworkManager();
 
   // NetworkManager interface.
   virtual void StartUpdating() OVERRIDE;
   virtual void StopUpdating() OVERRIDE;
 
  private:
   static void OnNetworkListCallbackHandler(void* user_data,
                                            PP_Resource list_resource);
 
   void OnNetworkList(const pp::NetworkListPrivate& list);
 
   void SendNetworksChangedSignal();
 
   pp::NetworkMonitorPrivate monitor_;
   int start_count_;
   bool network_list_received_;
 
   base::WeakPtrFactory<PepperNetworkManager> weak_factory_;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_NETWORK_MANAGER_H_