GitLab

Convert code to use enum DomCode rather than strings.

BUG=444048
R=wez@chromium.org,bbudge@chromium.org,bauerb@chromium.org,jcivelli@chromium.org,sadrul@chromium.org

Presubmit has failed to acknowledge the "LGTM" at https://codereview.chromium.org/1124963003/#msg29 so I'm adding this TBR as a workaround:

TBR=jcivelli

Review URL: https://codereview.chromium.org/1124963003

Cr-Commit-Position: refs/heads/master@{#330158}