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

net/ftp/ftp_ctrl_response_buffer.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 NET_FTP_FTP_CTRL_RESPONSE_BUFFER_H_
 #define NET_FTP_FTP_CTRL_RESPONSE_BUFFER_H_
 
 #include <queue>
 #include <string>
@@ skipping 10 matching lines @@
 
   FtpCtrlResponse();
   ~FtpCtrlResponse();
 
   int status_code;                 // Three-digit status code.
   std::vector<std::string> lines;  // Response lines, without CRLFs.
 };
 
 class NET_EXPORT_PRIVATE FtpCtrlResponseBuffer {
  public:
-  FtpCtrlResponseBuffer(const BoundNetLog& net_log);
+  explicit FtpCtrlResponseBuffer(const BoundNetLog& net_log);
   ~FtpCtrlResponseBuffer();
 
   // Called when data is received from the control socket. Returns error code.
   int ConsumeData(const char* data, int data_length);
 
   bool ResponseAvailable() const {
     return !responses_.empty();
   }
 
   // Returns the next response. It is an error to call this function
@@ skipping 50 matching lines @@
   std::queue<FtpCtrlResponse> responses_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(FtpCtrlResponseBuffer);
 };
 
 }  // namespace net
 
 #endif  // NET_FTP_FTP_CTRL_RESPONSE_BUFFER_H_