GitLab

This collects all chrome://sandbox webui plumbing files into a single
subdirectory.

No functional changes.

Bug: 997273
Change-Id: Idf78f2423d96986e487fa2a383e5af3dce7b74c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835679
Commit-Queue: Alex Gough <ajgo@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702209}