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

content/renderer/p2p/host_address_request.h

 // Copyright (c) 2011 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_HOST_ADDRESS_REQUEST_H_
 #define CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 12 matching lines @@
 // P2PHostAddressRequest performs DNS hostname resolution. It's used
 // to resolve addresses of STUN and relay servers.
 //
 // TODO(sergeyu): Name of this class may be confusing. Rename it to
 // something else, e.g. P2PHostnameResolver.
 class CONTENT_EXPORT P2PHostAddressRequest
     : public base::RefCountedThreadSafe<P2PHostAddressRequest>  {
  public:
   typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;
 
-  P2PHostAddressRequest(P2PSocketDispatcher* dispatcher);
+  explicit P2PHostAddressRequest(P2PSocketDispatcher* dispatcher);
 
   // Sends host address request.
   void Request(const std::string& host_name,
                const DoneCallback& done_callback);
 
   // Cancels the request. The callback passed to Request() will not be
   // called after Cancel() is called.
   void Cancel();
 
  private:
@@ skipping 25 matching lines @@
   // Accessed on the IPC thread only.
   int32 request_id_;
   bool registered_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PHostAddressRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_P2P_HOST_ADDRESS_REQUEST_H_