GitLab

- Move trivial initializers to declaration site
- Move Visit* methods to private section
- Remove unused parameter around Persistent APIs

Bug: 982754
Change-Id: Iec4102f1466a8b65251aa69892d041f450ac069e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1743636
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685265}