GitLab

invalidation_util.h/cc contained a few functions to convert between
InvalidationObjectId and string that were unused, so this CL removes
them.

Bug: none
Change-Id: I4b90fb78eaf4a1b4c43f193715ed9d67da4642f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943134
Commit-Queue: Marc Treib <treib@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Auto-Submit: Marc Treib <treib@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720189}