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This makes it easier to track the remaining usages of Xlib.  I plan on
removing headers from x11.h a couple at a time.  Once we're down to
just Xlib.h, I'll remove the Xlib.h include and replace it with manual
declarations for all the types and functions we need (XOpenDisplay(),
etc).  Then I'll continue incrementally removing types and functions
from there.

BUG=1066670
R=msisov,sky,penghuang

Change-Id: Ia80e911eb540f99c2a4aa3edf396f1e1cc982e5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373227Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801306}