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There are several classes/types named Display so to get
the X11 one, you have to specify it with ::Display (gfx::Display
is a common alternative when you're inside the gfx namespace).

TBR=hubbe@google.com

Bug: 822068
Change-Id: I402b7ad2d37a82d3091577733f3f06e673c29c7e
Reviewed-on: https://chromium-review.googlesource.com/994212
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Reviewed-by: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#547916}