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

content/renderer/p2p/ipc_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 CONTENT_RENDERER_P2P_IPC_NETWORK_MANAGER_H_
 #define CONTENT_RENDERER_P2P_IPC_NETWORK_MANAGER_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "content/renderer/p2p/socket_dispatcher.h"
 #include "third_party/libjingle/source/talk/base/network.h"
 #include "webkit/glue/network_list_observer.h"
 
 namespace content {
 
 // IpcNetworkManager is a NetworkManager for libjingle that gets a
 // list of network interfaces from the browser.
 class IpcNetworkManager : public talk_base::NetworkManagerBase,
                           public webkit_glue::NetworkListObserver {
  public:
   // Constructor doesn't take ownership of the |socket_dispatcher|.
-  CONTENT_EXPORT IpcNetworkManager(P2PSocketDispatcher* socket_dispatcher);
+  CONTENT_EXPORT explicit IpcNetworkManager(
+      P2PSocketDispatcher* socket_dispatcher);
   virtual ~IpcNetworkManager();
 
   virtual void StartUpdating() OVERRIDE;
   virtual void StopUpdating() OVERRIDE;
 
   // P2PSocketDispatcher::NetworkListObserver interface.
   virtual void OnNetworkListChanged(
       const net::NetworkInterfaceList& list) OVERRIDE;
 
  private:
   void SendNetworksChangedSignal();
 
   P2PSocketDispatcher* socket_dispatcher_;
   int start_count_;
   bool network_list_received_;
 
   base::WeakPtrFactory<IpcNetworkManager> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_P2P_IPC_NETWORK_MANAGER_H_