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

net/base/mock_file_stream.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.
 
 // This file defines MockFileStream, a test class for FileStream.
 
 #ifndef NET_BASE_MOCK_FILE_STREAM_H_
 #define NET_BASE_MOCK_FILE_STREAM_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "net/base/file_stream.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 class IOBuffer;
 
 namespace testing {
 
 class MockFileStream : public net::FileStream {
  public:
-  MockFileStream(net::NetLog* net_log)
+  explicit MockFileStream(net::NetLog* net_log)
       : net::FileStream(net_log), forced_error_(net::OK) {}
 
   MockFileStream(base::PlatformFile file, int flags, net::NetLog* net_log)
       : net::FileStream(file, flags, net_log), forced_error_(net::OK) {}
 
   // FileStream methods.
   virtual int OpenSync(const FilePath& path, int open_flags) OVERRIDE;
   virtual int Seek(net::Whence whence, int64 offset,
                    const Int64CompletionCallback& callback) OVERRIDE;
   virtual int64 SeekSync(net::Whence whence, int64 offset) OVERRIDE;
@@ skipping 39 matching lines @@
 
   int forced_error_;
   FilePath path_;
 };
 
 }  // namespace testing
 
 }  // namespace net
 
 #endif  // NET_BASE_MOCK_FILE_STREAM_H_