Fix undefined variables in chromium.ycm_extra_conf.py

My YCM was failing due to `database` and `extension` being undefined.
It seems like the root cause is https://crrev.com/c/4392504, but the fix
is pretty clear, so initialize both variables.

Change-Id: I9a7ea4ee8d943a967bbaa05a5fcd61240229355d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4396662
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Ɓukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1125684}
NOKEYCHECK=True
GitOrigin-RevId: a0711dd3c5e46dec60123e02dba74fc618a8f284
1 file changed