GitLab

Also rearrange directory structure slightly to group crash-related
source files.

Change-Id: Iae6bb34c9cb708ac4297cbbeb99be38f1481220a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1916826Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715673}