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There were some platform-specific code guarded by USE_X11 handling gtk
window displaying functionality. This CL moves it to GtkUiDelegate so
that it is shared between legacy and ozone backends. Additionally, this
also fixes focus issues in Ozone/X11 file dialog.

R=thomasanderson@chromium.org

Bug: 1008755, 1002674
Change-Id: I2c15b43cf7b8c1f625cb93cc1dcfa5d1945b15ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098591
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755643}