GitLab

Since there's no longer any DRM-master specifics in GbmBuffer, move it
to //ui/ozone/common/linux and remove GbmBoWrapper.

Bug: 869206

Change-Id: I079f157e2f8ad46ea1f68670421d6d700abba25d
Reviewed-on: https://chromium-review.googlesource.com/1155919
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579704}