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This Cl doesn't bring any functional changes, but just moves
the X11 code down to ui/base/x.

Bug: 1069469
Change-Id: Idaddec11dfbe88226a190d2ba4b5050ad38eed6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144056
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758493}