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

net/base/upload_file_element_reader.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 NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_
 #define NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/gtest_prod_util.h"
@@ skipping 59 matching lines @@
                        int result);
 
   // This method is used to implement Read().
   void OnReadCompleted(ScopedFileStreamPtr file_stream,
                        const CompletionCallback& callback,
                        int result);
 
   // Sets an value to override the result for GetContentLength().
   // Used for tests.
   struct NET_EXPORT_PRIVATE ScopedOverridingContentLengthForTests {
-    ScopedOverridingContentLengthForTests(uint64 value);
+    explicit ScopedOverridingContentLengthForTests(uint64 value);
     ~ScopedOverridingContentLengthForTests();
   };
 
   const FilePath path_;
   const uint64 range_offset_;
   const uint64 range_length_;
   const base::Time expected_modification_time_;
   ScopedFileStreamPtr file_stream_;
   uint64 content_length_;
   uint64 bytes_remaining_;
@@ skipping 29 matching lines @@
   scoped_ptr<FileStream> file_stream_;
   uint64 content_length_;
   uint64 bytes_remaining_;
 
   DISALLOW_COPY_AND_ASSIGN(UploadFileElementReaderSync);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_FILE_ELEMENT_READER_H_