GitLab

Many data members are not const but can be, especially pointers. Make
them so.

Change-Id: I82a1e3ab26507eaa88e239847eff84b24f7198b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876984Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714379}