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The recently landed change [1] has introduced a pure virtual method for
ui::Clipboard on Ozone, which has broken the hybrid build that has
USE_OZONE and USE_X11 set together.

This CL fixes that by adding a stub implementation of that method to
ui::ClipboardX11 with Ozone enabled.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2307234

Change-Id: Ia93c8b488f7ffd2009200f894acd6d77ccdb1351
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346671Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Auto-Submit: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#798706}