Make CopyDirectory() not copy the read only bit on Windows.

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index f8418318a6a7ecd92255e6d708624b7f1ae6bcf7..fbfe4d15f47d9df405c0e525653affa4a27451a5 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -97,6 +97,9 @@ BASE_EXPORT bool ReplaceFile(const FilePath& from_path,
 
 // Copies a single file. Use CopyDirectory to copy directories.
 // This function fails if either path contains traversal components ('..').
+//
+// This function keeps the metadata on OSX and on Windows. The read only bit on
+// Windows is not kept.
 BASE_EXPORT bool CopyFile(const FilePath& from_path, const FilePath& to_path);
 
 // Copies the given path, and optionally all subdirectories and their contents
@@ -105,6 +108,9 @@ BASE_EXPORT bool CopyFile(const FilePath& from_path, const FilePath& to_path);
 // If there are files existing under to_path, always overwrite. Returns true
 // if successful, false otherwise. Wildcards on the names are not supported.
 //
+// This function calls into CopyFile() so the same behavior w.r.t. metadata
+// applies.
+//
 // If you only need to copy a file use CopyFile, it's faster.
 BASE_EXPORT bool CopyDirectory(const FilePath& from_path,
                                const FilePath& to_path,