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

content/browser/renderer_host/p2p/socket_dispatcher_host.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_BROWSER_RENDERER_HOST_P2P_SOCKET_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_DISPATCHER_HOST_H_
 
 #include <map>
 
 #include "content/common/p2p_sockets.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/network_change_notifier.h"
 
 namespace content {
 
 class P2PSocketHost;
 class ResourceContext;
 
 class P2PSocketDispatcherHost
     : public content::BrowserMessageFilter,
       public net::NetworkChangeNotifier::IPAddressObserver {
  public:
-  P2PSocketDispatcherHost(content::ResourceContext* resource_context);
+  explicit P2PSocketDispatcherHost(content::ResourceContext* resource_context);
 
   // content::BrowserMessageFilter overrides.
   virtual void OnChannelClosing() OVERRIDE;
   virtual void OnDestruct() const OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
   // net::NetworkChangeNotifier::IPAddressObserver interface.
   virtual void OnIPAddressChanged() OVERRIDE;
 
@@ skipping 42 matching lines @@
   bool monitoring_networks_;
 
   std::set<DnsRequest*> dns_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PSocketDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_DISPATCHER_HOST_H_