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This is a very X11 specific method. Thus, move it to X11 space.

Bug: 990756
Change-Id: I69ee7b59f62c3bd3f2f4fd6af5a5a3183e04743d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834090
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702971}