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This change makes it so you don't have to resetart Chrome to see cursor theme
changes. Also move some X11 code out of gtk_ui.cc which didn't belong there.

BUG=1013426

Change-Id: I1bd3b98cf374783c6805ac23fc839bbf4b21395b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869557
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709216}