GitLab

Move RefCountedString16 from exo DataOffer to base where it can be
reused.

Change-Id: I0a3e13b006d690be1605c90da6d46274c4811685
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507235
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822791}