src: clean up node_file.h

- Move inline functions into an `-inl.h` file
- Move override function definitions into `.cc` files
- Remove `using` statements from header files
- Make data fields of classes private
- Mark classes at the end of hierarchies as `final`

This is also partially being done in an attempt to avoid
a particular internal compiler error, see
https://github.com/nodejs/node/pull/30475#issuecomment-554740850
for details.

PR-URL: https://github.com/nodejs/node/pull/30530
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/node.gyp b/node.gyp
index 810cea8c24..d8b5596083 100644
--- a/node.gyp
+++ b/node.gyp
@@ -613,6 +613,7 @@
         'src/node_dir.h',
         'src/node_errors.h',
         'src/node_file.h',
+        'src/node_file-inl.h',
         'src/node_http2.h',
         'src/node_http2_state.h',
         'src/node_i18n.h',