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This is in preparation for removing Xlib error functions.

BUG=1066670
R=sky

Change-Id: I495065cabcefff11dc63fb282dc0af1bdcf41342
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443790Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814328}