Modify CopyFileUnsafe() on OSX to stop copying ACL.

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index fbfe4d15f47d9df405c0e525653affa4a27451a5..8c37639d1cc1a8e0c51cbcff3c263d6a20c34a1b 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -98,8 +98,8 @@ 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.
+// This function keeps the metadata 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