GitLab

+ Adds 'const' to casts where appropriate
+ Fixes an unsafe write through one of these non-const pointers

Bug: 10278398
Change-Id: I6e7b30806143cbf38109de174e799521f7d1a1cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944282
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720519}