GitLab

- Rework on adding strings for helpful/unhelpful buttons.
- No need to create new grd file.
https://chromium-review.googlesource.com/c/chromium/src/+/1735525


Bug: 988117
Change-Id: Icfa104bbf176f2c9164200879393e8e8963881b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1739153Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684477}