GitLab

Although unlikely, it's possible that AutocompleteMatch::
InlineTailPrefix() could access past the end of its classification.
Check for this and avoid it. Also adds unit test.

Bug: 1013103
Change-Id: Iccb23643c06ca952567a99bfa7cbe7cdeb335d3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869117Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707554}