Jon Ross-Perkins 4421a75c36 file_name -> filename (#3791) ...

I wanted to choose one or the other. I think some code has been using
each from early on. We're predominately using `filename`, so
consolidating on that. This conveniently matches the [Google dev doc
style guide](https://developers.google.com/style/word-list#filename)
(which we use for docs) which says "filename: Not file name".

In toolchain:

```
╚╡git grep file_name . | wc -l
35
╚╡git grep filename . | wc -l
489
```

2024-03-18 17:26:24 +00:00

..

BUILD

Remove legacy repo_name settings (#3772)

2024-03-13 22:58:56 +00:00

source_buffer_test.cpp

Rename factory functions from 'Create' to 'Make' (#3706)

2024-02-14 18:26:56 +00:00

source_buffer.cpp

file_name -> filename (#3791)

2024-03-18 17:26:24 +00:00

source_buffer.h

Rename factory functions from 'Create' to 'Make' (#3706)

2024-02-14 18:26:56 +00:00